Unfortunately, reviews for the paid version say that the app still includes ads (a weird choice for a paid app), and there are a few reviews that even say the app crashes occasionally (though I've never experienced the problem of it not finding a song for me -- even with rarities and b-sides, it's always come through). But it's a real shame that reviewers are having problems -- while Shazam definitely needs to find a way to monetize its service, failing to provide a premium experience on a premium app obviously isn't the way to do it. Still, if you made the jump to the paid app already, or use Last.FM and/or Pandora often, it might be worth a look.
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Shazam adds Last.FM integration to iPhone apps

Unfortunately, reviews for the paid version say that the app still includes ads (a weird choice for a paid app), and there are a few reviews that even say the app crashes occasionally (though I've never experienced the problem of it not finding a song for me -- even with rarities and b-sides, it's always come through). But it's a real shame that reviewers are having problems -- while Shazam definitely needs to find a way to monetize its service, failing to provide a premium experience on a premium app obviously isn't the way to do it. Still, if you made the jump to the paid app already, or use Last.FM and/or Pandora often, it might be worth a look.