* Microdisney were like this, with Cathal Coughlan being the red oni and Sean O Hagan being the blue oni. Their music was known for the contrast between Cathal's angry/melancholic lyrics and Sean's euphonic, peaceful melodies. This became even clearer when the band broke up due to a clash between the onis - Cathal wanted to make more aggressive music, Sean wanted to make softer music.
* Queen: Freddie Mercury and Roger Taylor were Red Oni, while Brian May and John Deacon were Blue Oni.
* Music/{{Space}} had Jamie Murphy and Tommy Scott as the respective oni. Jamie was a FieryRedhead whose constant partying caused him to have a nervous breakdown, while Tommy was the more sensitive and introverted one of the two. The trope also applies in the musical sense as Tommy's songs were more melodious and romantic - albeit in a rather twisted way - while Jamie's were darker in tone, particularly on ''Spiders'', and more indie rock-oriented.
* During the heydey of {{Britpop}}, Music/{{Oasis}} (the loud, outspoken, 70's rock and [[Music/TheBeatles Beatles]]-influenced working class band) were the Red Oni and Music/{{Blur}} (the quieter, witty, [[Music/TheKinks Kinks]]-influenced band consisting of University intellectuals) were the Blue Oni. Because of their respective Oni characteristics, Oasis were the more popular of the two, while Blur had more critical acclaim. The two bands also ''hated'' each other for most of the 90's, and so did their hardcore fans.
* In HeavyMetal, there is the classic rivalry between Music/{{Metallica}} (Blue) and Music/{{Megadeth}} (Red).
* In Music/TheWho, Roger Daltrey was a more reserved, polite musician while Keith Moon was the CrazyAwesome drummer. They didn't always get along off-stage.
* Music/{{Aerosmith}}: Steven Tyler is the loudmouth, flamboyant frontman (Red) while Joe Perry is the quiet, mellow guitar player (Blue).
* Music/{{ABBA}}: playful and exuberant Anni-frid Lyngstad was the red oni, while discreet and reserved Agnetha Faltskog was the blue oni.
* Music/BonJovi: All-round nice guy Jon Bon Jovi is the red oni; and the more difficult, for lack of a better word, Richie Sambora is the blue oni.
* Music/SleaterKinney were an aural equivalent of this trope. Corin Tucker, whose voice was often harsh and abrasive, was the Red Oni. Carrie Brownstein, whose voice was generally much smoother and gentler, was the Blue Oni.
* Music/TheRollingStones had Mick Jagger and Keith Richards.
* The post-1999 Music/RedHotChiliPeppers had the loud and over the top Anthony Kiedis and the quiet, thoughtful John Frusciante, who got noticeably calmer and more reserved when he re-joined the band. Of course, his successor Josh Klinghoffer can fit the Blue Oni role as well.
* In the band Music/{{Rush}}, we have the goofy, playful guitarist, Alex, who is most definitely the Red Oni to quiet, shy, bookish drummer Neil's Blue Oni. Interestingly, Alex's HeterosexualLifePartner and childhood friend, the bassist/vocalist/keyboardist Geddy, is a Purple Oni- he's soft-spoken and quiet, but more approachable and personable than Neil, who often [[ShrinkingViolet doesn't show up for interviews, meet-and-greets, or special events because he's just not good with people]].
* Kix Brooks and Ronnie Dunn, respectively, of Music/BrooksAndDunn. Kix was the more active and energetic of the two in a live setting, while Ronnie was more straightforward and less showy.
* Likewise, Jennifer Nettles and Kristian Bush of Music/{{Sugarland}}. Nettles is very active and outgoing onstage, while Bush is more quiet and in the background.
* The music video for Wiley ft Chew Fu's ''Take That'' features two dancers, Shanie Ryan and Yasmin Ogbu. Throughout the video, Yasmin (Red) pulls many crazy facial expressions and mouths some of the song, while Shanie (Blue) retains the same neutral expression (save for the occasional smile) and doesn't mouth any of the words. Ironically, in closeup shots, Yasmin is cast under a blue light while Shanie is cast under a red light.
* Music/TheBeatles has two RedOniBlueOni pairs. One is charming crowd-pleasing Paul [=McCartney=] and deep meaning-searching John Lennon. There is also cheerful Ringo Starr and quiet George Harrison.
* Music/KingCrimson, from their 1980s incarnation onward, has a prototypical red-blue pair in their two guitarists, vocalist Adrian Belew and de facto leader Robert Fripp. Belew stakes his claim on raving, [[Music/TalkingHeads David Byrne]]-like monologues, [[EverythingIsAnInstrument bizarre guitar noises]], and dancing around on the stage, while Fripp sits in the corner unobtrusively and plays immensely complex lines, while presenting a generally intellectual image.
* {{Led Zeppelin}}: red Robert Plant's manic vocals and stage presence, blue Jimmy Page's steady and tight guitar virtuosity.
* {{The Doors}}' Jim Morrison was definitely the red to all the others' blue. In a biography, Morrison is recounted as saying that keyboardist and band elder (by about 5 years) Ray Manzarek could give him a certain DisapprovingLook and he'd know he'd "gone too far". But boy did he go pretty far a lot of the time....
* OzzyOsbourne (red) vs. the rest of Music/BlackSabbath (especially Tony Iommi) (blue).
* Most lead singers are probably going to be comparatively red by virtue of them being the main stage presence and the voice of the band, and expectations of being particularly energetic in concerts.
* The two major singers and songwriters for the {{Eagles}}, Don Henley and Glenn Frey, presented a red-blue contrast. Henley's rougher and raspier voice was generally put to use in their more energetic or "harder" ("Life in the Fast Lane", "Those Shoes"), or more emotional ("Desperado", "Wasted Time") songs. Frey's easier, smoother voice generally goes to the easy countryish songs ("Take it Easy", "Tequila Sunrise", "New Kid in Town"). Henley is red, Frey is blue. (And in their respective solo careers the contrast becomes more apparent.)
* Comparing the big two "British Invasion" bands of the early 60s, the {{Rolling Stones}} and {{The Beatles}}, the Rolling Stones played red to the Beatles' blue in their little rivalry. Even as the Beatles got harder and edgier in the late 60s, the Stones continued to be on the red side of them.
* In terms of genres, there's PunkRock (Red Oni) and ProgressiveRock (Blue Oni).
** There's also HairMetal (Red Oni) and {{Grunge}} (Blue Oni).
* HeavyMetal has many subgenres that form this dynamic with each other; a well-known example being the dynamic between BlackMetal (Blue; focused on atmosphere and ambiance) and DeathMetal (Red; focused on aggression and intensity).
** Another example would be ThrashMetal (Blue; focused on real-world issues and technical riffs) and PowerMetal (Red; focused on [[HeavyMithril fantastic lyircs]] and wailing leads).
** There's also {{Metalcore}} (Blue) and {{Deathcore}} (Red).
** Within DoomMetal, there is a three-way dynamic with GothicMetal (Blue), SludgeMetal (Red), and StonerMetal (Purple).
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