Love it when Audiogon members reveal that they also love music! Cover threads always turn me on to something new (in this case it was Eva Cassidy's version of Woodstock, which is unbelievably good). My contributions:
Slam dunk: (What's So Funny 'Bout) Peace Love and Understanding) by Elvis Costello (orig. Brinsley Schwarz/Nick Lowe) mentioned already I think.
Controversial pick: Dead Souls by Nine Inch Nails (orig. Joy Division)
70s Cultural Appropriation Choice: Take Me in Your Arms by the Doobie Brothers (org. Kim Weston)
Jazz selection: 107 Steps by Jeff "Tain" Watts (orig. Bjork)
Not sure it counts: Tears of Rage by The Band (orig. basement tapes w/ Dylan)