The music search feature is prominently placed above the main search results in what Google calls its "one box" area -- where information such as weather, movies or books may also be highlighted.Google is working together with partners such as Apple, RealNetworks, eMusic, Amazon, Wal-Mart and others. More details over at CNN.
When a user enters a music-related search in Google search box, the resulting search returns information about the artist, a few albums and a picture, when available, above the standard search results.
A link to "more" music results leads to user reviews, song titles and a choice of online retailers where the music can be purchased.
Competitors Ask Jeeves, MSN and Yahoo already have similar features.