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I'm using Songbird on Linux and it's pretty good. It was dog slow on earlier versions but now it's pretty fast.
 
there are only 2 good alternatives

1. songbird its nice, i don't like it but is not that bad, reminds me of earlier versions of mediamonkey

2. Amarok the best music software in all OS ever made

the only problem is that both are still in beta and are a little heavy for mac, i have just a little taste of my music in my MacBook and my huge 200 gigas(a lot of flacs) music collection in my linux desktop under the king Amarok :D
 
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