The Night Time theme is heard when 9:00 PM rolls around, or when Rosella has collected the three items demanded by Lolotte (the game jumps to 9:00 PM to speed things up). The theme was composed by William Goldstein.
King's Quest IV: The Perils of Rosella (DOS)
Five different types of output were designed for the DOS release, each output corresponds to a different group of devices, the Roland, Yamaha, OPL2, 3 Voice, and PC Speaker.
The file is sound.067 in the resource files.
It is unknown if the Amiga, Apple II, Apple II GS, or Atari ST ports have this song.