Along with Android 4.2, Google also revealed that is bringing something called Music Explorer to Google Play, which will allow users to discover similar music to what they have purchased or are looking at in the Play Store.
This does not seem to be an Android 4.2 exclusive feature, as Music Explorer is already rolling out to select userx, as they are now seeing an “Explore Similar Artists” option in their Google Play Store client.
It is the user interface of Music Explorer that makes it so interesting. You can also listen to the music that Music Explorer is suggesting you.
You can see the Music Explorer at work in this video from Droid Life.