Format of song
What format are the songs in the Music App, in my iMac?
How do I find out?
iMac 21.5″, macOS 10.15
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If it was purchased from the iTunes Store any time since 2010, it is in AAC format with a bitrate of 256 kbps.
For any other song in your library, right-click the track in your library, Get Info, and see the information on the File tab.