In case you missed it, you can Check It Out and use it free for a short time.
This article Says:
\”The Grove used to be a stodgy tome dedicated to long, turgid essays on classical composers and the esoterica of operatic arias. That\’s all still there. But this updated edition also has an incredible profusion of information about rock, jazz, folk, blues, country, and other musical styles — quite a change.\”