Rio by Duran Duran
I love that so much that I often look it up year around. I don’t care if it is near Christmas. I don’t even celebrate Christmas. But I dig that video, especially the Africa part.
I posted in another thread recently an a cappella version of Grapevine by Marvin Gaye. I can’t link to it here from work but it is worth looking for.
Check out the “Best of College Acapella” for 2008 and 2009. Some very awesome songs. You can use the performances to check the colleges for full albums.
Try looking at their new “Christmas Can Can” video.
There’s a group called “The Bobs” who released two albums about 20 years ago called “The Bobs Sing the Songs of …” and “The Bobs Cover the Songs of …”. The albums are mostly covers of familiar songs like Come Together, Purple Haze, Disco Inferno, and Psycho Killer.
The CDs are hard to find in record stores but you can get used CDs from half.com or Amazon. The tracks’ mp3s are available for digital download too.
There’s a local gorup here called Retrocity. All a cappella… noting but 80s! They are HILARIOUS! Their new website doesn’t have video yet, but keep an eye out. The only YouTube videos they have up at the moment are poor quality video taken at live shows, so it sounds like crap. I’m hoping their website will have better stuff in the near future.
ETA: They do have clip of Broken Wings by Mr. Mister on their site. But it’s not as funny. Most of their stuff is pretty funny.
I like her voice. That’s also her doing Let Your Love Flow in a recent Toyota Prius commercial, and this cover of Don’t Stop Believin’ (great video).
And I second The Bobs. Their live version of White Room back in the Janie Bob days could really raise the roof. And who else would cover They Might Be Giants?
Pinball Wizard sung a capella by the Ukulele Orchestra of Great Britain.
King’s singers :
Blackbird
I wanna hold your hand
Is that really instrument-free? Because if it is, that’s great!
I saw a group do Bohemian Rhapsody without instruments and as ridiculous as it was to have a guy making guitar noises by going “byoo-byew-byoo-byew” it was surprisingly effective when you had the whole effect of everyone immitating sounds and one really good beatboxer. There were definitely no instruments at the performance I saw, but if you closed your eyes, you’d wonder if maybe there were.
A couple of years ago (it was around Christmas) someone here posted a link to an acapella version of Rihanna’s “Umbrella”. It was really good, and if someone knows how to find it I’d like to hear it again.
You can download an amazing a capella version of “God Only Knows” here: セサミンと血圧の関係
I believe so. They run their lines through special effects filters; and even without the effects, their vocal percussionists are pretty spot-on. That and the bass appears to be amplified out the wazoo. Way more technical wizardry than I like for an acappella group, but instrument-free nonetheless 
I mostly like it for the arrangement.
ETA: I could certainly be wrong about it being instrument-free. But I am familiar enough with special effects to say that it’s plausible (and even likely) that it’s so.
From the same concert, Stanford Harmonics perform Dream for the Moment, a mashup of Aerosmith’s Dream On and Eminem’s Sing for the Moment. It’s more obvious that there’s no instruments in this one, and you can actually hear the true vocals beneath the effects processing. Although I’m still wondering why the crap they thought it was necessary to throw auto-tune in there.
I am grumpy that you cannot download their latest album. I really want to hear their cover of Soon, Love, Soon.
No love at all for the Nylons? This is the original quartet’s take on the Supremes’ Up The Ladder To The Roof, probably around '84 or so. Lots more like it on Youtube.
Not a hit song by any stretch, but you owe it to yourself to check out Sweet Honey in the Rock:
http://www.youtube.com/watch?v=c-YGzsUc2iE
You’re welcome. 
Dire Straits’ best song:
Not quite sure about the ultra-bass lead, myself.
The only thing wrong about the bass lead is that it takes the bottom out of the song. The song sound so much. . . fuller during the breaks where he carries the bass line.
Finding a good bass must be the hardest part of forming an acappella group.