Ambrosia is a tune that plays in Ultima III: Exodus in the mysterious land of Ambrosia.
There appears to be a bug in the original Apple II port where the Combat theme plays when you first enter Ambrosia, but, once you enter and leave a shrine, the Ambrosia theme plays properly. This behavior was fixed in the subsequent ports.
The unofficial title Ambrosia was used because this song is played in the land of Ambrosia. Various Internet sources also name this song Fanfare, though there is no known reason from where that title arose. Ken Arnold should be contacted for the official name of this song, failing that, game files should be checked for a proper title.
Ultima III: Exodus (A2)
Ultima III: Exodus (A8)
The Atari 8-bit port has comparable music that is used in the same place as the original Apple II release.
Ultima III: Exodus (C64)
When the game was ported to the Commodore 64, the music was arranged for the SID chip, probably by Ken Arnold, but it may have been done by the game's porter, Chuck Bueche. The music functions in the same manner as the Apple II release, but has a "buzzy" sound compared to the original.
The song is track 10 in the SID file and plays on the 6581.
Ultima III: Exodus (AMI)
The Amiga port features similar music and used in the same places as the original game.
Ultima III: Exodus (AST)
The Atari ST port features similar music and used in the same places as the original game.
Ultima III: Exodus (PC98)
In the PC-98 port, the Ambrosia theme is played, not on Ambrosia, but during the game's ending sequence. It's also slightly longer with a few extra notes added to the end of the song in the same style as the original. The song is played at a slightly faster tempo as well.
The song is rendered on the YM2203 (OPN) and uses the file name M10.BIN.
Ultima III: Exodus (PC88)
Like the PC-98 port, the PC-88 renders the song on the YM2203, but at a lower quality.
Ultima III: Exodus (GBC)
A bootleg Game Boy Color part was made which includes this song rendered on the APU of the Game Boy's DMG-CPU B.