Sad 1 is one of several morose themes that plays randomly in SimAnt when something bad happens. This can include being killed by a spider, ant lion, or red ant, as well as disasters like being sucked up into the lawn mower or sprayed by insecticide, and even just the general game over theme. It was composed either by Matthew Berardo, Steve Hales, Jack Thorton, or Chris Schardt.
The title comes from the song's file name and the meta data in it.
This is the original version of the song.
The song is index 26 in the SOUND.DAT file and "SAD1.MID" is the title in the MIDI meta data.
The Windows version of the song plays much slower than the original DOS version.
The song's file name is SAD1.MID, and "SAD1.MID" is its title in the MIDI meta data.