Sinfonia Concertante in C major T.289 No.4 (3) Johann Christian Bach Download 'Sinfonia Concertante in C major T.289 No.4 (3)' on iTunes
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The Piano Guys: 2 - an album guide
This is a Piano Guys original work, rather than an arrangement of an existing piece or song, and features sounds created by nothing but a cello and a kick-drum. It's quite something, as you can imagine.