I don't think that you want rsync. If you want to rip CD's again you can look at using a script called adbcde with lame.
https://www.google.com/webhp?sourcei...0adbcde%20lame
There are also utilities that will help you to edit the meta data. Doing those two things you should help you to get the various mp3's that you have under control. If you have the same album stored multiple times with different metadata, then rsync is not going to combine the various versions, but fixing the metadata should help you to find duplicates.