One of the innovative features of the Windows Phone 7 hubs concept is the ability for third party developers to integrate with certain hubs in order to add features in a seamless manner. A number of apps that show up in the Music & Videos hub were shown off at the Billboard Music event last week in San Francisco.

Shown above, MusixMatch Lyrics will let you download lyrics for songs, but it also can recognize music you are already listening to, and display lyrics for those songs as well.

Slacker Radio was shown with its nicely-designed panoramic layout.

iHeartRadio lets you tune into streaming radio stations from a variety of cities.

Here’s a look at how some of them show up in the Music & Videos hub.

(via CNET via Windows Phone Blog)