Ordering music discs from libraries is great and all, but only if you know exactly what you want. It is not easy to browse or preview items. This is where Internet radio has some good synergy. I feel it is wise to listen to something other than my personal music collection from time to time; wise in the same way that inbreeding is not. I note the songs I like and see if any libraries have them.
I’ve found that Radio Paradise is a great resource for discovering songs or bands I like.