One of the earliest uses of mobile apps was to identify music on the go. I remember using Shazam on a flip phone many moons ago. The apps are more robust these days, but you still have to open them in time to catch the song. BASE Music Sensor says it can do better. It sits in the background and listens for music passively without wrecking your battery. Or so the developers claim.
BASE Music Sensor Claims To Continuously ID Music In The Background Without Killing Your Battery was written by the awesome team at Android Police.