Composer
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Connections
Grab the Bandcamp release. It has all the bonus tracks, is (at this writing) name your own price, and Bandcamp gives the artist the highest revenue percentage.
Extraction
Source engine
game directory\Refunct\Content\PaksRefunct-WindowsNoEditor.pak
Used UE4 Pak Unpacker.exe
This exported as .uasset files
Music in
Refunct\Content\Textures\Music
Then use Umodel UE Viewer to extract/convert uasset files to ogg
Might be a QuickBMS script that would do it more efficiently