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An easy way to find all the non-MP3 songs would be to create a smart playlist of everything where Kind contains AAC (see attached screenshot), then use that to convert everything.

One thing to note, though...moving from AAC -> MP3 isn't necessarily a good idea for a couple of reasons:
  1. Transcoding from one lossy format to another is going to sound pretty crappy, and
  2. In general, lower bitrate AAC files (assuming they were ripped directly from the source) sound as good as higher bitrate MP3s.

...so, while you _might_ save some HDD space, you're more likely to end up with crappy-sounding tunes...and no one should have to suffer that.
 

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An easy way to find all the non-MP3 songs would be to create a smart playlist of everything where Kind contains AAC (see attached screenshot), then use that to convert everything.

One thing to note, though...moving from AAC -> MP3 isn't necessarily a good idea for a couple of reasons:
  1. Transcoding from one lossy format to another is going to sound pretty crappy, and
  2. In general, lower bitrate AAC files (assuming they were ripped directly from the source) sound as good as higher bitrate MP3s.

...so, while you _might_ save some HDD space, you're more likely to end up with crappy-sounding tunes...and no one should have to suffer that.
Better solution: Use Kind does not contain MPEG for the smart playlist criteria. Your solution grabs AAC files only. Mine grabs Apple Lossless, WAV, AIFF, and anything else, in addition to AAC. ;)
 
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