Multiple genres are not honored with FLAC or mp3

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FLAC supports multiple genre tags.

Expected: If a FLAC file is tagged "Metal" and "Punk" it should show up under both categories.

Actual: Song shows up in the first listed tag only.

The ID3 method for multiple genres is to use a separator, usually semicolon.

Expected: If an MP3 is tagged "Metal; Punk" it should show up under both categories.

Actual: Song shows up in a genre called "Metal; Punk"

It might be nice to be able to configure this separator character as an option.

More information here: https://www.blisshq.com/music-library-management-blog/2011/03/12/multiple-genres-in-mp3s/