There's got to be quite a few; here's 3 off the top of my head.
"Shine on You Crazy Diamond"--a truncated concert version:
"Killing Me Softly"--a category natural: << I sifted through a lot of covers--none of the others even come close.
"How Long (Has This Been Going On)" << never to be confused with the GAS tune, done most memorably by Ella Fitzgerald

You contributions please.