Quantum Leap:
The DVD releases of Season 1 and 5 are unaltered.
I have the syndicated versions of season 2-4 recorded from Sci-Fi Channel , which does not have the music replacement, but does have the syndicated versions of the opening credits. Im sure there could be other edits to the syndicated versions.
The streaming versions currently available via Netflix are unaltered.
Strangely, the Hulu versions are altered.