Ha ha - it doesn't have to be a history of Western music professor, although there's a lot of great Western music that just doesn't get used. Even overused composers like Tchaikovsky have lesser known or used pieces - why not use them ?!
I also love Latin music, African music , and percussion and stuff with Asian influences - for example the kind of eclectic stuff that Yo Yo Ma does with Silk Road (D10 used one for his FS this year). There 's also a lot of great popular music - both vocal and instrumental, acoustic and electric - from the 1940s through today that probably would work well.
I agree with Sam that if music was incorporated into a school or university curriculum it would help. My first exposure to classical music, opera, etc. was at home, but I also had the opportunity to sing and play an instrument in school, and the university I attended wanted us to be well rounded so I had to take a music survey course there as well. But I think a lot of those opportunities and requirements have been cut to save money.
Still, for someone who wants to learn, Google and You Tube are fabulous resources. I get the feeling that many skaters and choreographers limit their music research on You Tube to clips of skaters rather than exploring farther afield.