The version of Zak McKracken with the most music is the FM-Towns version, and that's quite rare. The other versions only have little music.
Loom for the FM-Towns also is a rarity, though it has lovely music, very near the talkie version's in quality.
Luckily, you can get Ogg files of both these games' tracks by going here, to Soundfont Island. They're in the Music Section.
(This is not a plug. I repeat, this is not a plug.