This is on my "SW Dev songlist" ever since my CS professors (Robin Dawes and James Cordy) ran a singalong event in CISC 200/210.

Others include "Under the wings of a transistor"[1] and "The Privacy Song"[2]. Also "The System Administrator Song"[3]

Also codemonkey, but others have mentioned that one already.

[1] https://www.youtube.com/watch?v=lfpYgts-18o [2] https://www.youtube.com/watch?v=7eIUOUfhoJ8 [3] https://www.youtube.com/watch?v=eaIhKBYjTXA