One of the new features that ships with Jelly Bean is Google's Sound Search widget that helps identify songs after listening to short samples. If you've ever used SoundHound or Shazam, you know exactly what this does. The difference is this widget is pre-installed on Jelly Bean, comes directly from Google, and hooks right into Google Play.
As it turns out, the widget works on ICS as well. I looked into the package and saw that compatibility goes back as far as Honeycomb, so I'm guessing it will install there too (sorry, no Gingerbread or below).