Go on MySpace, Last.fm, Pandora, hypem.com, music blogs, your friend's last.fm, go somewhere and just listen to some stuff you've never heard. I mean, really search for hours until you find something that speaks to you, and when you do you'll know what they meant by "music". I really think they meant music in the sense that you know it by something other than movies, shows, or videogames.
I've done this quite a bit, actually, but in the form of youtube browsing. I found out about Richard Galliano this way. Also, I even listen to music from video games I've never played, so it's not that I really like the video games, I just find myself enjoying their soundtracks.