The PCE packs include both chiptune and cd music, you can tell by the filenames and how they sound and I think the quality is good enough from comparing one game with a youtube upload.
Though I guess some tracks could be streaming audio as well? I haven't heard anything on there so far that sounded like it was streaming audio which on PC at the time, and Mega CD, would generally be in mono and lower quality. I think I've heard the equivalent for PCE in YT clips but those could be bad quality uploads.
Anyway that's PCE CD covered, up to and including 1994 for now.