- Awesome Music: Due to the level of musical skill required to pull off a good a cappella performance, there are many contenders.
- One highlight from Season 3 is Afro-Blue's jazz reinterpretation of Estelle's "American Boy."
- And we can't leave out Pentatonix' performance of Video Killed the Radio Star, or Let's Get It On, which elicited a standing ovation from BEN FOLDS!!!
- Just when you think Pentatonix couldn't possibly top themselves again, they unleash their secret weapon.
- According to Sara Bareilles, the best performance of Season 3 was the Dartmouth Aires' Queen medley. One sees her point.
- Urban Method, for the Christmas Episode, give us their rendition of "You're A Mean One, Mr. Grinch".
- Home Free vs. Filharmonic, "dueling" on Caddyshack's "I'm Alright," ended up with a raucous, hilarious and incredibly fun performance.
- Covered Up: Has been known to happen, especially when a good group performs a "Current Pop Hit" or "Guilty Pleasure" . For instance, after hearing North Shore's doo-wop take on Bruno Mars' "Lazy Song," it's tough to recall the original.
- Pretty much anything Pentatonix has done... seriously.
- Elimination Houdini: Vocal Point in third season, whose survival essentially amounted to pity because the baritone's father died just before filming.
- Funny Moments:
- On The Rocks' elimination speech, with a love letter to the judges
- For Guilty Pleasure week, the Yellow Jackets, a group of college guys performed Wannabe by Spice Girls. The results were amazing.
- And then they hammed it up for the swan song, with Chumbawumba's "Tubthumping"."Shawny boy... Benny boy... Sara boy..."
- Ben Folds' Piss-Take Rap in honor of Urban Method has to be seen to be believed. So here you are.
- Ben Folds and Sara Bareilles did a duet of "Baby, It's Cold Outside". They have... differing opinions on it.
- Padding: Notable in weeks after the first few eliminations, when it seems like they show more material off-stage about the groups' preparations for their performances than the performances themselves.
- Seasonal Rot:
- There are accusations, inevitably that "groups in Season X are much weaker than groups in Season X-1."
- The decision to reduce Season 5 to a single two-hour special (giving each group only one or two performances at most to impress the judges) compounds the accusations of rot for some viewers.
- Shocking Elimination: While this is inevitable for fans of nearly any group, the fairly early elimination of North Shore from Season 3 caught even the reviewer for Rolling Stone magazine off-guard.
YMMV / The Sing-Off