The Night Time theme is heard when 9:00 PM rolls around. The game maintains a real-time clock, so, if the player spends several hours in the game, they will hear this tune, or, the game will jump directly to 9:00 PM once Rosella collects the three items demanded by Lolotte. 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.