Chris's journey of making the intro music is used as a backdrop to explore how to make music in Milkytracker, a FOSS program for making tracker music, as well as to explore a bit of sound theory, what chiptunes and tracker music are, and even a bit of exploring what it's like to learn something new even when you aren't necessarily very good yet.
c64.com, an archive of Commodore 64 games/programs (pretty much all proprietary though). Many of these have interesting cracked demos that are as interesting as the programs themselves.
Listen to the Monty on the Run main theme
Not shown in the podcast but you really also ought to listen to the Commando theme for the Commodore 64
Brandon Walsh's milkytracker / chiptune tutorials (Content warning in that he does say an ablist slur somewhere in those videos.)
Music theory stuff
freesound, amazing commons of useful samples for your music composition needs
I guess maybe you want to look at Chris's sound file sources (but probably not) (All CC BY-SA 3.0, like the show)
Made it all the way to the end of the podcast and this blogpost? I guess you really did stay awhile...