Clips of the scenes with the replacement music by J. Peter Robinson (with dialogue and sound effects, not clean music) are available at the Star Trek History site here:
http://www.startrekhistory.com/DS6.html
They've also added a new bit to that page, restoring Fred Steiner's rejected cue for the "mechanical rice-picker" scene (which was replaced by a piece of library music by Joseph Mullendore in the final episode). It's interesting, but I can see why the Steiner cue was rejected; it was a bit too busy and intense and kind of stepped on the scene (although maybe that could've been ameliorated by mixing it down more).