for a mac download this software: [
tmkk.pv.land.to]
you can convert you flac to mp3 and import them directly into iTunes.
if you search on google you will find a couple of tutorials on how to use it. it's the best audio converter on the mac and updated regularly.
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and if you still don't know why flac is better than mp3 and will not spend 15min googleing the flac/mp3 issue you might be better off listening to mp3.