Can't Remove the Pain, often titled Bootup was composed by Todd Porter for Ultima VI: The False Prophet.
The official title comes from the Origin Soundtrack album, however, many people refer to this song as Bootup because it plays as the game boots, and it's file name is Bootup.m.
The song can be played on six different sound cards, though the Innovative SSI-2001 and Covox Sound Master soundtracks have yet to be recorded.
Although the song is only 1:48 in length, the actual music file loops the song doubling the time to 3:36. Since the game automatically loops the music, the second play through is redundant. The reason for this loop is unknown, but a second song The Wander, also loops internally.