Yes, it's Ke$ha (surprise, surprise), but it's not just her. It's a cover of Bob Dylan's "Don't Think Twice, It's Alright" Something about the lyrics mixed with the emotion Kesha expresses is one of the most moving things I've ever heard. No studio. No auto-tune. This was recorded sitting on her bed, alone, using garage band. Simply stunning and beautiful.

http://www.youtube.com/watch?v=b6S0CwxT_bs
http://www.youtube.com/watch?v=b6S0CwxT_bs
http://www.youtube.com/watch?v=b6S0CwxT_bs