Shazam is useful, but if you’re looking for the dorkiest musical iPhone app, check out Ocarina. It allows these kids to sit in a circle and play the recorder intro to “Stairway To Heaven.” Bravo, technology.
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I was surprised by how much fun this is to play, and their site has the “sheet music” for a bunch of songs. You can also listen to people around the globe playing on their phones!