I think you are thinking of the Billy Idol song, Guys Without A Face.
DarthEnderguy said:
Yoda tells Luke as he's dying, "Don't underestimate the powers of the Emperor. Once you start down the dark path, etc. etc." Perhaps appropriate music at the right parts ("Vader. You must confront Vader." "Once you start..."), the music can infer that Luke is filled with bitter feelings. Similarly during his conversation with Ben, though that might take more restructuring. That could be dark foreshadowing for Luke's later entrances. If we include the Vader/Luke mental contact with appropriate foreboding music, as well as his entrance to Jabba's Palace, it may very well indicate Luke is drifting to the Dark Side. Heck, even other points, like after Luke says, "I'm with you too," and Leia asks, "What's wrong?" Or on the shuttle when, "Vader's aboard that ship." I mean, the music can take things up a few notches, but it can all begin on Dagobah with Yoda's warning. Hopefully GoodMusician is still with us, though I haven't seen him for several days.
The music is a pretty good cheat.