I think you may be mistaken--the unheard music cues IIRC are not heard in ANY version. They were cut out by Irvin Kershner because he felt they distracted from the tension. The Probot landing, Han's arrival at Echo Base, the AT-AT's approach, Luke's force training, Luke's duel with Vader all were scored with music, whereas in the film they play with just sound and dialog. Much better this way. Building Empire restored some of these to show you what it would have been like with them in it, as the music tracks appears on the 97 SE CD's, although Building Empire forgot to include the terrific bit for the AT-AT's approach.

Unless you are talking about something completely different.