I won't assume you are trying to use an mp3 illegally - many stock music libraries sell audio as mp3 now, and you may (like me) work in an environment where your client (say, a broadcaster) has a blanket agreement to allow the use of all music. Or you may write your own music. Whatever - I'm sure you are aware of copyright laws when it comes to distributing material for profit.
I make regular use in the field of my iTunes library - it would be impossible to carry everything with me any other way.
You've probably noticed by now that FCP doesn't like mp3's. Oddly, iMovie has never been so squeamish about it. There are, however, solutions.
For many years, I've burnt the track I needed to a CD, then dragged the AIFF into my media folder, and imported that into FCP. At a few pence/cents a black CD, it's pretty quick and easy - if a little crude.
Alternatively, you can now use Digital-Heaven's excellent 'Loader' - for a small price this automates this process, and does a lot more besides. Highly recommended:
http://www.digital-heaven.co.uk/loader
Hope that helps.
Edit Out Ltd
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FCP Editor/Trainer/System Consultant
EVS/VT Supervisor for live broadcast
RED camera transfer/post
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