If you like to play music in the classroom, consider these sites.
Pandora: Enter a song (or artist) that you like; Pandora will create a radio station that plays music similar to the song you entered. You can tweak the profile by giving a thumbs up or down for each song.
Musicovery: Pick a mood, decade, or genre; Musicovery will play songs that match what you’re looking for.
Both sites are a great way to discover new artists. Enjoy!