PC World reports that Microsoft Bing has added a way to search for music available within Xbox Music.
Now, if you search for a song, for example [U2 all that you can't leave behind] on Bing, on the right hand panel, you will see a box for “Listen to music.”
There, you will be able to either buy the song on Apple iTunes or Amazon MP3 or listen to it on Xbox Music.
Here are a screen shots:
Xbox Music allows you to stream a few hours of music per month before requiring you to pay for an Xbox Music Pass, which offers access to 18 million tracks for $10 per month.