[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/pentatonix-pic_9951.jpg]]
[[caption-width-right:350:From left to right: Mitch, Scott, Kirstie, Kevin, Avi]]

Pentatonix, or "PTX," as they like to call themselves, are an ACappella singing group consisting of five incredibly talented young musicians: Scott Hoying, Kirstie Maldonado, Mitch Grassi, Avi Kaplan, and Kevin Olusola. Scott, Kirstie, and Mitch grew up together in Arlington, TX. They recorded a YouTube cover of ''Telephone'' by LadyGaga in an attempt to win a "meet the cast of Glee" cover band. They didn't win the contest, but when Scott learned about ''TheSingOff'', they were inspired to audition. They added Avi, the bass singer, on the advice of a mutual friend, and invited Kevin to join them on vocal percussion after seeing his viral "cello-beatboxing" youtube video.

Together, the group produces a unique, full, layered sound that almost seems too complex to come out of five people. Scott, Kirstie, and Mitch form the melodic and harmonic core of the music, while Avi and Kevin lay down a remarkably solid base. Pentatonix won the third season of ''TheSingOff'', and have been creating impressive cover arrangements and original songs ever since. They have two EP albums out thus far with a third on the way, and they regularly release Youtube videos of their covers. The video for their cover of Music/{{Gotye}}'s ''Somebody I Used to Know'' is wildly popular, with over 10 million views as of April 2013. They've performed pop, electronic, dubstep, and hip-hop music in their signature ACappella style.
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The albums they've released thus far are:
* PTX Volume 1 (June 2012)
* [=PTXmas=] (November 2012)
* PTX Volume 2 (November 2013)
* Unnamed Full Length Album (2014)

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!!Pentatonix provide examples of the following tropes:
* ACappella
* {{Adorkable}}: All of them, especially when they're geeking out about one of their interests. (For example, Scott talking about Beyonce or Mitch talking about corgis)
* AfterTheEnd: The setting for their cover of ''Radioactive'' with Music/LindseyStirling. Blasted, graffiti'd buildings, oversaturated visuals, and costumes with plenty of dusty leather and goggles. BadAss.
* AntiLoveSong: Original song "The Baddest Girl".
* AttentionDeficitOohShiny: Arguably in their collaboration with Todrick Hall:
-->Kirstie (as the Witch of the West): "Don't want no money! (to Avi/Lion) I like your beard."
* AudienceParticipationSong: One of the most well-received part of their concert is where they divide the audience into thirds and have each third sing a part (as Team Scott, Team Mitch, and Team Kirstie), then have Avi and Kevin do their thing beneath.
* BassoProfundo: Avi, full stop. The man can rattle the floorboards on incredibly deep, low tones.
* {{Bowdlerise}}: They tend to remove curse words and other potentially racy language in their songs, the most notable being their performance of "OMG" on TheSingOff, explained in part by Kevin's very religious background. Fortunately, it rarely if ever gets in the way of their songs and it [[TropesAreNotBad really does make the songs more child friendly.]].
* ChristmasSongs: An album of them, appropriately named [=PTXmas=].
* CloudCuckoolander: Scott can be this.
* ComicalAngryFace: The behind-the-scenes for their "Radioactive" cover features a "super-frown count" of Lindsey Stirling and several members of the group doing their comical angry faces for various reasons. Final tally? Four.
* ConceptVideo: Thus far two of their music videos.
** The video for their cover of ''Starships'' by NickiMinaj. The band puts together a spaceship out of random household objects!
** The video for their cover of ''Aha'' by ImogenHeap. Zombified band members stalk a man and his girlfriend!
* CoverVersion: The majority of their songs so far.
* FiveManBand
** TheLeader: Scott
** TheLancer: Mitch
** TheChick: Kirstie
** TheBigGuy: Avi
** TheSmartGuy: Kevin
* FiveTokenBand: Very nearly a natural example: Two white guys, a Hispanic girl, a Jewish guy, and a black guy. Oh, and the white guys are both gay.
* HalloweenEpisode: The video for their cover of ''Aha'' by ImogenHeap. ACappella music by way of a zombie flick.
* IcyBlueEyes: The band sports pale blue contact lenses in their "Daft Punk" video, except for Kevin who wears futuristic CoolShades.
** CurtainsMatchTheWindow: Kristie also wears a pale blue wig and make-up job in this video.
* {{Medley}}:
** Their Music/BritneySpears cover, from TheSingOff
** Their Music/{{NSYNC}} medley, from their YouTube channel.
** Also, the "Evolution of Music" video. A medley spanning over five hundred years' worth of popular music.
** "The Evolution of {{Music/Beyonce}}" which is exactly what it sounds like.
** A Music/DaftPunk medley, simply titled "Daft Punk".
* MrFanservice: Judging by his intro part in "Pusher Love Girl", Avi seems to have taken this role, but mostly only in the music.
** Watch them perform "Let's Get It On" live in concert. [[http://www.youtube.com/watch?v=hAboEgHvBbM Avi provides free lap dances for the "chair girls."]]
* NeoclassicalPunkZydecoRockabilly: ACappella pop, ACappella hip-hop, ACappella electronica...
* NobodyLovesTheBassist: Averted entirely. Avi has a very robust fandom.
* TheOner: Most of their youtube videos consist of the group sitting on a couch in front of a stationary camera and singing live.
* OneOfUs: Mitch and Kirstie have been noted on Twitter talking about manga. Kirstie in particular is a fan of {{Anime/Sailor Moon}}.
* SelfTitledAlbum: Well, almost. PTX is a nickname for the group.
* SesameStreetCred: They're set to appear on a future episode.
** A clip from which can now be seen [[http://www.youtube.com/watch?v=0b-v-wMR69k here!]]
* SomethingCompletelyDifferent:
** Their collaboration with Music/LindseyStirling on ImagineDragons' ''Radioactive.'' ACappella music... with cello and violin.
** In their concerts, they bring out Kevin's cello and have him cello-beatbox in order to give the rest of the vocalists a bit of a break.
* VocalTagTeam: Scott takes lead most often, but Kirstie and Mitch carry several songs apiece. Even Avi gets into the mix on several of their tunes.
* VoiceTypes: The average American has a vocal range of one-and-a-quarter octaves; a trained singer typically has two and a bit. The members of Pentatonix have a ''lot'' more, easily qualifying as [[IncrediblyLamePun bisectional]].
** Avi is a BassoProfundo but can function as a tenor. [[http://youtu.be/fu2adThK7NQ One video]] pegs his range as ''three-and-a-half'' octaves.
** Scott primarily plays tenor lead, but can function as a bass.
** Kevin is a high tenor on the rare occasions when he sings (in ''Run To You'' his part is notated as an alto part sometimes and a tenor at others).
** Kirstie tops out at mezzo-soprano, but has access to the whistle-tones made famous by MariahCarey.
** And though Mitch typically plays the part of the alto, he is actually some sort of super-human, running the gamut from tenor to soprano over the course of ''Aha!'' alone. When they do ''Bohemian Rhapsody'', it's ''Mitch'' who hits the high note, not Kirstie.
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