Happy birthday, iTunes!
iTunes v1.0 was announced and released on January 9, 2001. I don't think a day has gone by since that date that I haven't used iTunes. Seriously. It's probably the most regularly used app on any of my machines. Love it or hate it, for better or worse, you have to acknowledge that iTunes has had a huge impact on how music is consumed. Amazing. (Kirk McElhearn has written a fifteenth anniversary tribute that covers the milestones.)
And, lest they be forgot, here's a shout out to the developers of SoundJam MP, the jukebox app that Apple bought and re-christened as iTunes: Bill Kincaid, Jeff Robbin andmost especially as far as I'm concenedDave Heller, who incorporated AppleScript into SoundJam and then iTunes.