johnthearbiter98: I was trying to get music working for Quake II since I heard on this site that it wasn't working for Windows 10 PCs (at least since the Anniversary Update), so I tried adjusting the game with tweaks recommended in this site's Quake forums by copying or moving the music folder into the baseq2 folder in File Explorer. Even after doing that, the music was STILL not playing.

Does anyone recommend any other adjustments I could make so that I the music would actually play in the format that GOG provided?

djdarko: I wrote a guide that should help (and yes you can use the ogg files that GOG provides with the game. Though I have uploaded higher quality files, mentioned in the guide.)
https://www.gog.com/forum/quake_series/quake_1_2_quickstart_guide_music_and_source_ports

Using the included files involves several extra steps, becuase the tracks need to be renamed:

Quake 2
Rename the following files and place them here (in your Quake 2 installation folder):
baseq2\music djdarko: Quake 2 Ground Zero
Rename the following files and place them here (in your Quake 2 installation folder):
rogue\music djdarko:

Voodoo84: You don't need to move "music" folder into "baseq2". Yamagi will properly recognize GoG version of the soundtrack and use it. In essence, when you install Quake 2 via GoG, you get the following folder structure:

baseq2/ <- quake 2 game data
music/ <- common for both quake 2 and mission packs
xatrix/ <- mission pack 1 game data
rogue/ <- mission pack 2 game data
etc.

So you just need to unpack Yamagi .ZIP archive into the Quake 2 folder and it will work as-is (this is also written in Yamagi readme.txt file).