Impulse Tracker lets you use any arbitrary file as a sample, even if there’s no header information on it (it lets you specify how to interpret the data, as long as it’s some form of linear PCM). Although all of the songs on this album have at least one sample created by using a non-sound file as a sound in this way, for this song I used nothing else. The best one by far is the drum loop: COMMAND.COM from MS-DOS 6.22.