One of the new features of Android 4.1 Jelly Bean is a new app called Google Ears. This app is meant to replace such 3rd party music apps like Shazam or Soundhound; It will hear a song, recognize it for you and link you back to the Google Play Store catalog to buy the track if you so please. While the app was originally for Jelly Bean devices only, some amazing person was able to extract it and ported it over to work on non-rooted ICS devices. I for one use Soundhound all the time but if Ears is any better, I wouldn’t mind taking a stab at it. The download link is below. Install at your own risk (but there’s really no risk at all).