Whenever I'm down I watch "The Glen Miller Story" and realise why music has been my life. I don't like the last five minutes, but then that's true of the "Buddy Holly story" too. Saw some "Old grey Whistle test" pieces from the 70's. Sonny Curtis and the Crickets singing "I got a feeling called the Blues" put a smile of sheer contentment on my face for hours. Failing that, try "Spinal Tap"