It seems that music collections for the 20th and 25th anniversaries were a thing.
https://sonic.fandom.com/wiki/History_of_Sonic_Music_20th_Anniversary_Edition
https://sonic.fandom.com/wiki/Sonic_the_Hedgehog_25th_Anniversary_Selection
Worth keeping in mind in case this was taken from something like that.
https://sonic.fandom.com/wiki/History_of_Sonic_Music_20th_Anniversary_Edition
https://sonic.fandom.com/wiki/Sonic_the_Hedgehog_25th_Anniversary_Selection
Worth keeping in mind in case this was taken from something like that.