Ok depending on your situation.

If you were watching TV or a movie, or sitting in a public space with background music, this would be good for identifying it. But if you don’t use your Mac in those situations, it becomes pointless, since it doesn’t have any way of recognizing when the audio is being produced by iTunes, which means if you just let your library play Shazam will tag it all. If you usually listen to music that way, this version of Shazam is going to have to be turned off all the time anyway.

DMacB about Shazam: Identify Songs, v1.0.1