Rock Trio is a band of three members: the lineup is typically one playing guitar, one playing bass and one playing drums. The Rock Trio is essentially rock and roll with a bare minimum of musicians, with one member, usually bass and never drums, doubling on vocals and the guitarist doubling the rhythm and lead parts. The Rock Trio is thus commonly found in bands that stick to Three Chords and the Truth, though the format had its roots in bands that were more experimental with their music. The Rock Trio took off in the 1960s thanks to developments in amplifier technology that allowed for the volume of guitars and bass to increase. From there, the format was popularized in the blues-rock and hard rock genres before spreading to prog rock in the 1970s and falling in popularity in the early 1980s. In this first wave, the format was commonly used by bands that engaged in long, intrinsic improvised solos and bombastic jam sessions. This version of the Rock Trio contributed heavily to the development of heavy metal, especially power metal. Some bands at this time took a "3+1" approach , having a core Rock Trio with a fourth on vocals. Prog rock also introduced a variation that swapped the guitar for a keyboard, while keeping the same general idea. After the original wave fell out of favor, the format was later adopted by punk rock and grunge bands in the late 80s and throughout the 90s, finding the stripped-down ensemble to fit perfectly with their stripped down approach to music. Several notable punk bands from this time still exist today. The Rock Trio also continued to remain popular in progressive rock, though prog as a whole was in a down period at this time. Today, the Rock Trio continues to be used in all varieties, as well as in bands that use it as their core while adding supporting instruments and a dedicated vocalist. It should be noted that a Rock Trio is more commonly referred to in the music industry as a power trio but that name's already taken. Not coincidentally, the Rock Trio is itself a subtrope of our Power Trio. Musically, it could be compared to a Freudian Trio in that the drums focus on the beat (Superego), the guitar focuses on the melody (Id) and the bass reconciles the two (Ego), though this says nothing about the personalities of the musicians themselves. Despite the name, the Rock Trio is not strictly limited to rock bands: several pop and metal bands have taken the general idea of the format and made it work. Note that many Rock Trios often add "touring" musicians for live shows, especially on second and subsequent tours. Typical choices are a second guitarist to handle the parts created by overdubs by the principal guitarist in the studio or a keyboard player to handle song elements that can't be recreated live by the basic setup. A multi-instrumentalist who can switch from guitar to keyboard to a wind instrument is also a common choice. These touring members often contribute additional percussion and backing vocals to tracks where additional instrumentation isn't required. Sometimes touring members become official members at a later stage leading to the band evolving beyond the Rock Trio concept.
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- K-On! College has the band OnNa Gumi. Akira Wada is the guitarist, Sachi Hayami is the bassist and Ayame Yoshida is the drummer.
- Airheads: The Lone Rangers are comprised of Chazz on guitar and lead vocals, Rex on bass guitar and backing vocals, and Pip on drums.
- Alkaline Trio: Matt Skiba (guitar), Dan Andriano (bass) and Derek Grant (drums).
- Irish band Altar of Plagues used to have two guitarists, but are now this.
- Andromeda (UK, late '60s)
- Ash, Northern Irish rock band. Were a originally a three-piece before being joined by guitarist Charlotte Hatherly, who then left and they are now this again.
- Atomic Rooster, with their first two albums.
- According to Pete Best, John, Paul and George wanted The Beatles to be this, but were told they couldn't tour without a drummer, hence his inclusion and subsequent replacement with Ringo Starr.
- Beck, Bogert and Appice; power trio featuring Jeff Beck and former Vanilla Fudge members Tim Bogert and Carmine Appice.
- Better Than Ezra following the suicide of guitarist Joel Rundell. Jim Payne has yet to be named an official member.
- Word of God is that it's been offered to him, but he's politely declined.
- blink-182: Tom DeLonge (guitar), Mark Hoppus (bass) and Travis Barker (drums).
- Blue Cheer, with their first two albums.
- Brownsville Station
- Carcass's original line-up was this before they hired a second guitarist.
- And now, as of 2012, they have gone back to this format.
- Cream, the likely Trope Codifier: Eric Clapton, Jack Bruce and Ginger Baker.
- Crosby, Stills & Nash, before Neil Young joined them.
- The Cure, in their early years. Their albums Three Imaginary Boys, Faith, Pornography, Japanese Whispers and The Top all fall into this pattern, although with increasing use of keyboards and guest musicians as their career progressed.
- Industrial Metal band Device count as this, consisting of singer David Draiman, guitarist Virus (of Nu Metal band Dope), and drummer Will Hunt. Being Industrial Metal they are an aversion of the Three Chords and the Truth tendencies of this trope.
- Dinosaur Jr.
- Die Ärzte
- The Doors attempted this after the death of Jim Morrison, but it didn't work out.
- Dying Fetus, at least since 2007.
- Emerson, Lake & Palmer
- The Foo Fighters recorded their third album, There Is Nothing Left to Lose as this (as they had just fired William Goldsmith; Chris Shiflett came in for the album's tour).
- The Fratellis
- Genesis started out as a five-man band but were gradually reduced to this: Phil Collins, Mike Rutherford and Tony Banks.
- Grand Funk Railroad, from 1969 to 1971.
- Green Day (pictured), though in 2012 they decided to add touring guitarist Jason White as a fourth member after 13 years with him onstage.
- Guided By Voices were this on their first album.
- Hüsker Dü
- The Jam
- The Jimi Hendrix Experience
- King Crimson for a brief period in the 70s; in the 90s, they billed themselves as a six-man band containing two of these.
- King's X
- Klymaxx in their 1990 album
- Manic Street Preachers, after the disappearance of fourth member Richey Edwards.
- A very rare example from Country Music: McBride & the Ride. They briefly became a six piece band due to Executive Meddling, but the most familiar lineup fit this trope.
- The Melvins up until 2006 - currently they have four members, two of whom are drummers.
- The Minutemen
- Motorhead, which has always been Lemmy + 2.
- Averted while Würzel was in the band, from 1984 to 1995 - he shared guitar duties with Phil Campbell, who stayed and is still in the band.
- Muse: Matthew Bellamy, Chris Wolstenholme and Dom Howard.
- Mx Px
- The Nice, after the departure of guitarist David O'List.
- Nirvana: Kurt Cobain, Dave Grohl and Krist Novoselic.
- Paramore is since December 2010 officially Two Guys and a Girl... though the only time it was performed by just them was in an EP. Guest drummer and rhythm guitarists are usually brought for studio or tours.
- Brazilian band Os Paralamas do Sucesso: Herbert Vianna (vocals/guitar), Bi Ribeiro (bass) and João Barone (drums)
- Also from Brazil, Legião Urbana became this after their original bassist, Renato Rocha, left and frontman Renato Russo took over his instrument on studio. In fact, Rocha was always a replacement musician; he was brought into the band because, during the recording of the first album, Russo (who was officially singer/bassist) slit his own wrists and could not play.
- The band Pezz, currently known as Billy Talent, started as this before bringing Ian D'Sa in to play guitar so Ben Kowalewicz could stick with vocals.
- Pig Destroyer used to be an unusual example: just vocals, guitar and drums, forgoing bass altogether. In more recent years they've had a fourth member in charge of noise and samples.
- The post-Roger Waters Pink Floyd could count - though it was not the traditional setup (a guitarist, a keyboardist, and a drummer, and the first two sung) and lead to hired bassists (and extra singers for touring).
- British band Placebo, although they drag around several additional members while on tour.
- The Police: Sting, Andy Summers and Stewart Copeland.
- The Presidents Of The United States Of America
- Before all the others, there was Elvis Presley, guitarist Scotty Moore, and bassist Bill Black. Drummer D.J. Fontana joined later to make the trio a quartet.
- Rage's most iconic lineups have all been rock trios, especially the classic lineup of Peavy Wagner (bass/vocals), Manni Schmidt (guitars), and Chris Efthimiadis (drums).
- REM after the departure of drummer Bill Berry.
- Reverend Bizarre
- Revocation, at least until they hired Dan.
- Rush: Geddy Lee, Alex Lifeson and Neil Peart.
- Shonen Knife
- Sick Puppies
- Sleater-Kinney, a guitar-guitar-drums trio (no bass).
- Soft Machine, from 1967 to 1969. Their debut was recorded with a trio lineup, and their second record, though featuring Brian Hopper on alto and tenor sax as a fourth player, still only lists the core three as full-time members. Amusingly, by the release of their third album a year later the group for a short while went from formally being a trio to having as much as seven members, adding four brass players to the lineup at once.
- Stoner metal trio Sleep, started out with four members but were most successful after the departure of one guitarist.
- Stray Cats. The minimalism extended to the drummer who usually only had a bass drum, snare drum, and one crash cymbal.
- Switchfoot was this for their first three albums. Their fourth member joined just before they hit it big, and the fifth joined just after.
- Sunny Day Real Estate were this on their album The Rising Tide.
- Heavy metal band Tank started this way in a line-up similar to Venom and Motörhead (vocals/bass, guitar, drums). Just like them they later added a second guitarist, but while Venom and Motörhead returned to three members, Tank not only remained with two guitarists ever since, but they eventually expanded to five members as in 2008 they replaced founding bassist/vocalist Algy Ward by Chris Dale and Doogie White respectively (of course, unless you believe Algy, who claims he is the only member who owns rights to use the name).
- The Tea Party, the recently reunited 90s Canadian alt-rock-with-ethnic-flavour trio.
- Thin Lizzy, during the Eric Bell-era.
- The German band Trio actually is a mild subversion because they have no bassist.
- Triumph, aka "the other power trio from Canada".
- V6, which did the theme songs for InuYasha and Eyeshield 21, contains two with the band releasing albums and touring both independently and as a combined group. This is evident in Eyeshield 21, where the Coming Century trio did the first intro song and the 21st Century trio did the second. The two combined to do the InuYasha theme song.
- Supergroup U.K. became this for their second album when they decided not to replace their original guitarist after he was fired.
- Van Der Graaf Generator, with their most recent works, Trisector, A Grounding In Numbers and ALT.
- Venom New Wave Of British Heavy Metal band and the progenitors of Black Metal. They briefly performed as quartet between 1987 to 1992.
- Whiplash, except in the 90's.
- Wolfmother's original formation. When the band came back, it was now a four-piece.
- Wolves in the Throne Room's original line-up was this, before they got a bassist in. They were also this at some other points of their history, but they're currently a duo consisting solely of the Weaver brothers.
- Wreck of the Hesperus
- XTC became one after the band retreated to the studio and drummer Terry Chambers left. They used studio drummers for their albums from that point on until David Gregory finally left, leaving them a duo.
- ZZ Top, a.k.a. "those two bearded guys and the drummer".
- The newly (as of August 2011) reconstituted Deathmøle (if they even choose to keep that name without Natasha around), in Questionable Content, fits the mold with Marten on guitar, Amir on bass and Hannelore on drums. In the short time since they got back together there's been no mention of adding a fourth member again; granted, so far it's just one semi-impromptu jam session, but clearly Marten has bigger plans this time around.
- Ménage à 3 has Zii and the Troublemakers — Zii on lead guitar, Sonya on bass, Yuki on drums, with the first two apparrently sharing the vocal duties.
- Phaeton has the Auds, one with a multiform instrument, one with vocal powers and one who can only make noise by hitting one thing with another thing.
- In the Strong Bad email, "concert," Strong Bad sees Strong Sad's favorite band, sloshy, prompting this exchange:
Strong Bad: Were they missing some members? Where was their lead guitarist?Strong Sad: Uh, that was the whole band.Strong Bad: What!? You're not allowed to have a band with only three people in it!
- Alvin and the Chipmunks are sometimes this, depending on the adaptation. When they do, it's Alvin on guitar, Simon on keyboard/piano and Theodore on drums. Canonically, all three are multi-talented with instruments and the most recently films have had Simon on bass, fulfilling the traditional definition.
- Josie and the Pussycats replaces the bass with a tambourine. Like with Alvin, the film swapped the tambourine with a bass guitar, or rather returned to original comics, where Valerie also played bass.
- Scooby-Doo! and the Witch's Ghost gave us The Hex Girls, a goth rock trio led by Thorn (Lead vocals/Lead Guitar), with Dusk (Drums) and Luna (Bass/Keyboard) on backing vocals. The band has evidently proven popular enough to have been brought back in later iterations of the franchise.
- The Sonic triplets in Sonic Underground, with the bass replaced by Sonia's keyboard.
- The Powerpuff Girls were one in "Mime for a Change", with Blossom on guitar, Buttercup on bass, and Bubbles on drums and lead vocals, with the other girls providing backing vocals.
- In an episode of The Life and Times of Juniper Lee, the title character forms one called Short Angry Freuds consisting of herself on guitar, her older brother Dennis on bass, and younger brother Ray Ray on drums.
- ChalkZone: The main trio, as Rudy & The ChalkZone Band/Gang (the last part changed after Hynden Walch, Penny's speaking voice, took over singing duties for the character from Robbyn Kirmsse, due to the first nine ending songs being written out of Walch's vocal range for Penny) were one in the show's ending music video segments, with Snap on guitar, Rudy on keyboard (instead of bass), and Penny on drums.