Shazam passes the 50 Million users mark

Shazam, the mobile service that helps you find (and buy!) songs based on their audio signature has just announced that they have passed the (impressive) milestone of 50M users. This is huge, and it’s not surprising that Shazam is already profitable. However, to grow even faster, the company has brought new investors in, probably to have the resources to develop its business. Are you using Shazam? If yes, how often?