"Youtube Musician" Mike Tompkins uses his "voice and mouth" (not to mention a teensy bit of post production) to cover well known pop songs. Whilst obviously far, far from the first to do this sort of thing, his videos - Coldplay's Paradise and Adele's Rolling in the Deep, for example - are perhaps unusually polished affairs, and make much of his facial expressiveness, which apparently comes from his involvement in theatre at an early age. [more inside]
posted by Hartham's Hugging Robots on Jan 8, 2012 - 21 comments

The Blanks perform Katy Perry, Cee-Lo, and Duck Sauce. You might know them from elsewhere.
posted by djgh on Dec 1, 2010 - 11 comments

Bad Romance a capella SLYT
posted by cthuljew on May 31, 2010 - 84 comments

Pilgrim Productions Presents: Voices Across America, an archive of gospel music in a variety of genres, submitted for free play and download by church groups and folk and traditional groups across the country and beyond. Style, age, and quality vary greatly, but fans of noncommercial music will enjoy hunting for the gems of blues, Cajun, bluegrass, choral, shapenote, country, vintage, and mountain gospel and more.
posted by Miko on May 24, 2009 - 15 comments

Yet another Thriller cover. One man. 64 channels of a cappella. SLYT
posted by Ambrosia Voyeur on Oct 31, 2008 - 30 comments