As you people know, both Quake and Dissolution of Eternity have a problem with the music, mainly it plays the next one for a few seconds before the loop begins. As mentioned in one thread, it's caused by the incorrect CUE sheet. Just to make things easier for you, i've uploaded the fix for it, so you don't have to open the Notepad and edit the CUE files for the correct order.

Link

Just replace both of the cue files with the ones downloaded.

Thanks to triplett for posting the fix in the thread mentioned in a form of text, to make this one possible