Oxford Music Online – formerly Grove Music Online. This is a fantastic tool to use when researching music genres, composers, etc.
http://www.oxfordmusiconline.com
NAXOS Music Library – Browse NAXOS to listen to more than 1 million musical selections.
http://osuni.naxosmusiclibrary.com/
Piano for Pleasure website – this website is used in conjunction with Music 1101.01 and Music 1102.01 (Group Piano for Non-Majors I and II).