ITunes shows mp3 Files in library but does not play them?

Hi,
I am having trouble with my library. I have a number of tracks in my iTunes folder which show up in my library, however when I click on them, nothing at all happens. The Diamond does not move and the track does not play.
This is odd, as other tracks on the album, and which are included in the album folder do play, but iTunes has decided it won't play some of the tracks.
Interestingly, the tracks it does play all show up with the album artwork if I view the folder, however the ones it does not play only show up with the MP3 file icon. And just to throw another twist in, I can play the files which iTunes wont play, in cover flow...
So how do I gt iTunes to play all the songs again? Will rebuilding my library work?
And finally, iTunes has categorised a load of album files in an "unknown" folder, despite these files having full artist, album, genre etc information in their tag. Can I get iTunes to put these into the correct albums somehow?
Many thanks!

As for the files not playing, you might want to check their permissions. Select the mp3 files in your finder, go to File>Get Info, look under Sharing & Permissions, and make sure you have Read & Write
privileges.

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