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The app -- which is available for Android, Symbian, Windows Mobile 7 and now for iPhone and iPod touch [iTunes links] -- scans your music library, allowing you to listen to your music and tap to uncover lyrics while you jam. Right now, the app has around 5.5 million songs, so pickings are relatively robust.
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Users can also share lyrics to their social networks, check out trending searches and search for specific songs.
Music recognition service Soundhound has a similar offering, allowing users to identify songs and pull up lyrics for "Now Playing" tracks on one's iTunes. That service, however, only has access to 500,000 lyrics at present.