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.
musagi and the musagi tutorial
The Commodore 64 computer and its famous SID chip
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.
Monty on the Run with its music by the famous Commodore 64 composer, Rob Hubbard
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
Moments by Mr. Lou (mp3) and the original XM file (zipped) Really worth listening to the XM in Milkytracker so you can see how things work.
More cool music on the bottom of Milkytracker's downloads page and especially on The Mod Archive.
Famitracker (Free software so why the heck is it Windows-only still? Someone finish porting it!)
Milkytracker's documentation page has of course its own manual but also a number of interesting historical music tracking guides
Brandon Walsh's milkytracker / chiptune tutorials (Content warning in that he does say an ablist slur somewhere in those videos.)
Music theory stuff
Learn music theory in half an hour (well, some of it)
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...