looking askance since '63 has posted his own MP3 recording of 4' 33", John Cage's infamous silent piece. He also mentions the Frank Zappa version on a John Cage tribute album. I have this on my MP3 player. When it pops up via shuffle mode, it always gets my attention and then my focus turns to ambient sounds. Entertainment and art.
Notes: According to iTunes, this interpretation is in fact 4:33.084 long. Alan Little on yoga, listening and 4'33". Essay by Larry Solomon. Sheet music available for $4.95 with a look inside the music.