A few weeks ago, singer-songwriter Jonathan Coulton was surprised to learn that his arrangement of the Sir Mix-A-Lot song "Baby Got Back" was covered note for note by the cast of the Fox TV show Glee. Coulton talks with Bob about having his melody stolen with impunity and the legal gray area between copyright law and cover songs.

Mos Def - Ms. Fat Booty

Bach recycled music all of the time -- both his and other people's. Bartok and Dvorak rewrote folk tunes. So why all the fuss about Osvaldo Golijov?