Some musics missing on iTunes ...

Hi all!
I'm just a recent user of iTunes.

I updated all my music to it, without problems. But meanwhile I run into a small issue: some musics (mp3 files) are missing on iTunes.

I did not move or edit them. iTunes just doesn't recognize them. I tried to add them manually to iTunes, but they don't appear on the library. Tried to convert them to .aac and then add but it didn't work either.

Some of the files missing are from an album with about 11 songs. 3 are on iTunes. The others aren't. This happened for at least 15 songs.

Any suggestion?

Thanks

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