The launch of the Apple iPhone 4S has people raving about Siri, the talking-assistant app. It lets users speak into their devices and the app fulfills requests like scheduling plans or replying to text messages. But it also works with music.

In the Apple video trailer for Siri, a person in running clothes asks the app to queue up his running playlist, and seconds later, the music starts. At first, this feels like a gimmick, but if and when Siri becomes integrated with music apps-such as Shazam, TuneWiki, Songkick, Pandora, and Spotify-it could transform music and the way people interact with it.

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