If you're interested in commercial applications of this tech, Mediaguide placed radio receivers in major markets, sampled audio there, and fingerprint matched i

If you're interested in commercial applications of this tech, Mediaguide placed radio receivers in major markets, sampled audio there, and fingerprint matched it, selling reports of what they found. Two buyers of such data would be music content holders as well as advertisers, both of which want to make sure every airplay was paid for or whatever.