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11 Essential Ingredients Every Blog Post Needs (from Copyblogger)

Not strictly a cappella, but it features a cappella god Mike Tompkins (my secret love muffin crush) so I'll include it here. :)

Shenandoah - Peter Hollens (A cappella) - Proceeds Benefit Cerebral Palsy

Dark Side (Kelly Clarkson) sung a cappella by Madilyn Bailey & Peter Hollens. The more I listen to this, the more I dig it.

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.

Justin Bieber's "Pray", covered by Peter Hollens, Therry Thomas and Courtney Jensen

I think this is my all-time favorite a cappella cover - "Without You," sung by Peter Hollens and hottie J Rice. :)