If you can't quite think of the name of that song, Google's Sound Search feature from Android 4.1 Jelly Bean has been hacked for users of Ice Cream Sandwich. Sound Search comes in the form of a widget that will listen for music playing nearby, then look it up and display a link to it on Google Play Music. This widget comes from the ever vigilant ROM hackers of xda-developers but, while it did work flawlessly for us, it's hardly official and should be approached with caution. If you're feeling ambitious enough to try it, we'd recommend flashing Sound Search via the "flashable zip" in ClockWorkMod rather than installing the APK, which requires an audio library be pushed (with permissions) to the system/lib folder. If all of that sounds a bit technical, you might be better served to wait for an official upgrade (which, as always, could be quite a wait) and stick with old standbys like Shazam and SoundHound in the meantime.