Really well done. I doesn't sound a capella at all. Probably the best produced example of this type of covers.

edit: I just watched the video for the original song with Rihanna. I think I like the cover better (even though it has no Rihanna in the video)

Originals here:

http://videosift.com/video/Baby-On-Board-a-capella-from-the-simpsons

http://videosift.com/video/Baby-On-Board-a-capella-by-a-girl-from-the-simpsons

Since you liked the other one, you might also like this one http://videosift.com/video/Baby-On-Board-a-capella-by-a-girl-from-the-simpsons
In reply to this comment by dag:
Sensational. I too love me some Barbershop - though I'm not sure about the blues invocation.

True, the blues was kind of a stretch. Changed it around now.
>> ^dag:

Sensational. I too love me some Barbershop - though I'm not sure about the blues invocation.

Tags for this video have been changed from 'Sacramento, State, jazz, Ben Folds, Selfless, a capella, vocal, music' to 'Sacramento, State, jazz, Ben Folds, a capella, vocal, selfless cold and composed' - edited by dystopianfuturetoday

Curses! Thanks for spotting it since I didn't see it

In reply to this comment by demon_ix:
Alas, the Star Wars a capella was already posted.

http://www.videosift.com/video/Star-wars-4-part-acapella-set-to-various-movie-themes -> http://www.videosift.com/video/a-capella-tribute-to-John-Williams

Alas, the Star Wars a capella was already posted.

http://www.videosift.com/video/Star-wars-4-part-acapella-set-to-various-movie-themes -> http://www.videosift.com/video/a-capella-tribute-to-John-Williams

This video has been declared a duplicate; transferring votes to the original video and killing this dupe - dupeof declared by demon_ix.

*dupeof=http://www.videosift.com/video/a-capella-tribute-to-John-Williams

Tags for this video have been changed from 'Acapella, A Capella, A Cappella, Singing, U2, With or Without You' to 'Audiosift, Acapella, A Capella, A Cappella, Singing, U2, With or Without You' - edited by calvados

Tags for this video have been changed from 'muse, knights of cydonia, a capella' to 'muse, knights of cydonia, a capella, a cappella' - edited by calvados

doesn't auto-tune make this not a capella?

Tags for this video have been changed from 'a capella, singing, vocals' to 'a capella, singing, vocals, vocapeople, voca people' - edited by lucky760

This looks decently difficult indeed, especially if you're not used to singing a song a capella.

Comment hidden because you are ignoring dag. (show it anyway)

I'm a sucker for tight a capella musicians - though I'd rather see these guys performing out on a street corner - they are very good.