Sounds crazy, I know. I'm gonna get my M3 on Sunday so I'll be able to answer this myself. Those USB input jacks - can you hook up a portable CD (well, they're all DVDs, these days, but they'll deal with any optical disc format so who's counting?) and play your Eagle's Greatest Hits, or Nitty Gritty Dirt Band, Will the Circle be Unbroken Volume 1, or, ..wait, don't let me get away with myself. Anyway, you get my drift. USB is supposed to mean universal serial bus, so, it should mean, well, you get my drift. Will it? Huh? Will it?