A Cappella Music
Not strictly a cappella, but it features a cappella god Mike Tompkins (my secret love muffin crush) so I'll include it here. :)
This video is bizarro, but close your eyes and just listen to these kids. AMAZING. "Titanium" [music video] - Voices in Your Head (a cappella)
My collegiate a cappella group, The Pennharmonics, singing "Wanting Memories" by Sweet Honey In the Rock. I'm in the second row, far left.
This year's "The Sing Off" winners singing "Somebody That I Used to Know". Crazy good.