Tests have shown that plants apparently really like to rock out to a good, solid dose of Ozzy and the boys.

According to guyspeed.com:

Chris Beardshaw (garden designer and TV presenter) says that during a recent study of the effects of plant life when subjected to different types of music, he found that those plants that were fed a sonic diet of Black Sabbath fared much better than plants forced to listen to the likes of Cliff Richards.

We already knew that. :-D