iphone - Check if user has a song from iTunes in his library -

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i building iphone app music album released on itunes, client requested if user purchased album, app should allow play these songs in app while playing games. need find way how quicly check if song available in ipod library. i've heard every song itunes has unique id have no idea how use it. searching name of song not option in library mine cause have on 20 gigs of music ...

thanks,

ondrej

you have 20 gigs of music data, not names. searching unique id involves same number of searches name, have same number of tracks. happens if user bought cd , ripped ipod?


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