What scores would someone else quote? Star Trek? A true point yet neither of them wrote the ORIGINAL theme which was by Alexander Courage which is quoted through the series. Other than Alien what films even have sequels which those composers themselves haven't scored? But don't worry I'm sure Humanoids from the Deep Return will feature Horner's stirring theme. Justin And Alexander Courage, in 1987, wrote new music for "Superman IV: The Quest for Peace" integrating it with original music by John Williams