Simple question here, how gog guys managed to enable music? What is it? CD emulation, fan made engine with ogg support?

Thx

In the DOS version, CD emulation internal to DOSBox. Nothing special to it.

At release, the glquake version had ogg tracks playing instead of a CD through a clever .dll hack, but some obscure legal issues forced them to remove it, so it now has no music. You can easily put it back, but it requires "ripping" the "CD". Better instructions in other threads.

For even better results, use something other than glquake.

Blame people who own NIN licnese, even NIN hates em for this.

You can however mount a disk image via virtual disk or burn it on your CD and still have music in GLQuake.

Well, at least the gameplay is still intact. If you don't wanna run everything thru DOSBox, simply grab the freeware version of Quake and copy the PAK files from your GOG (or even Steam) version. Done.