1 of 10
India Morrison, Matt Giraud, Kris Allen, and Justin Williams leave us wanting more after ''I Want You Back''
An entertaining rap, stellar beatboxing, and our first real glimpse of season 8 American Idol winner Kris Allen: The foursome's performance (arguably the best group number ever seen during Hollywood Week) went down so smooth, it's no wonder they called themselves White Chocolate. —Kate Ward
2 of 10
Kimberly Locke and Frenchie Davis duet on ''Band of Gold''
The season 2 contestants were forced to sing together in Hollywood, because ''some of the other female contestants were apprehensive about singing with us,'' according to Frenchie. As they should have been: The two belters whipped together a fun, jaw-droppingly powerful performance that cemented them as the contestants with the Midas touch. —KW
3 of 10
Anwar Robinson, Mario Vasquez, and Jamar Jefferson deliver sweet performance of ''I Can't Help Myself (Sugar Pie Honey Bunch)''
Remember during season 4 when we all thought Mario Vasquez would be the next Kelly, Ruben, or Fantasia? Hardly do we. But one reason the singer enjoyed front-runner status during his short stint on the show was due to the polished vocal work he displayed during his group number, which also featured some textured harmony from finalist Anwar and attention-grabbing antics from Jamar. We couldn't help ourselves from grooving like the judges. —KW
4 of 10
Michael Evans, Matthew Buckstein, and Garet Layne Johnson giddyap out the door after ''Do Wah Diddy Diddy''
Idol labeled Michael, Matthew, and Garet the ''Broke Note Cowboys'' for a reason. The season 5 contestants' performance of the Manfred Mann number ''Do Wah Diddy Diddy'' suffered from so many botched lyrics and earsplitting key changes, Simon told the trio, ''I think you will look back on this in a few months' time and wonder why you possibly blew the opportunity of a lifetime by trying to be bad comedians.'' But the BFF contestants got the last laugh: Michael, Matthew, and Garet were so memorable, they were invited back to the finale to perform ''Mamas Don't Let Your Babies Grow Up to Be Cowboys'' (at least not ones that try out for American Idol). —KW
5 of 10
Jermaine Purifory, Jannell Wheeler, and Casey James of ''Middle C'' keep it simple with ''Closer'' by Ne-Yo
When in doubt, do not dance! The simple, slow presentation allowed for careful harmonies and chances to showcase each voice. Casey James' solo line — ''I just can't stop'' — would turn out to be true for most of season 9. —Annie Barrett
6 of 10
Terrell Brittenum, Anthony Hansen, Elliott Yamin, and Jose ''Sway'' Penala fall apart during ''The Shoop Shoop Song (It's in His Kiss)'' by Cher
The tyrannical Tyrell got mad at Elliott Yamin for sleeping and eating breakfast, at one point snarling to the camera, ''I DON'T DO GROUPS.'' He was right: Terrell and ''Sway'' both forgot their lines and the performance was a huge disaster. But Elliott did great! —AB
7 of 10
Neapolitan and Destiny's Wild get caught in a ''Bad Romance'' battle
A feud to go down in the American Idol vault. Destiny's Wild and Neopolitan both chose ''Bad Romance'' and opted to go a cappella, a highly original move that Destiny's Wild refused to believe Neapolitan could come up with themselves. Something about the song must have cast a spell over the judges, though, because both performances were pretty terrible in their own way, yet everyone went through to the next round. I still loved the intensity of Destiny's Wild's rendition, which showcased Jareb's mastery of Gaga's cat-scratch move, Todrick's acrobatics, and Theri's off-key but confident melisma — the harmonizing at the end was awkwardly bad. Apparently something was going right with these groups, though, since they brought us Paige Miles and Siobhan Magnus. —Stephan Lee
8 of 10
Blake Lewis, Rudy Cardenas, Thomas Lowe, and Chris Sligh go deep with ''How Deep Is Your Love''
Lewis' beatboxing more than made up for the group's spotty harmonies in season 6. Plus, what's not to love about a self-made echo to end a song? —Sandra Gonzalez
9 of 10
Michelle Dellamore, Charity Vance, and Ashley Rodriguez try really hard to be ''Irreplaceable''
Two of the three ladies in this trio cracked the top 24, and even though you might not remember them (then again, who remembers season 9 in general?), this Hollywood Week performance of ''Irreplaceable'' is hard to forget. —SG
10 of 10
Adam Lambert and others sing ''Some Kind of Wonderful'' as Adam eclipses them all
Yes, we feel bad about the ''others'' part too. But let's be honest, watching this group's performance in season 8, is there any doubt who the eventual star was? —SG