Google’s music search enhancements address an area that is important to a large number of Web users, she said.

“Two of the top 10 queries in the United States are music-related, ”

https://googleblog.blogspot.com/2009/10/making-search-more-musical.html

new music search feature makes it easy to find music. Just search for an artist, album, song or even a few lyrics to get song previews from our partners. The feature is rolling out slowly over the next few days, so please keep checking back if you don’t find it at first.