Unofficial Yamaha XG MIDI Songs (awm_songs) pack:

Extract all the files from the awm_songs.zip file onto the
\awm_songs\ folder of your Yamaha Softsynth software.

SYG20 > \Yamaha\SYG20\awm_songs\ or \Program Files\Yamaha\SYG20\awm_songs\
SYXG50 > \Yamaha\SYXG50\awm_songs\ or \Program Files\Yamaha\SYXG50\awm_songs\
SYXG100 > \Yamaha\SYXG100\awm_songs\ or \Program Files\Yamaha\SYXG100\awm_songs\

Overwrite the existing MIDI files with the ones from the zip file as necessary.