Guitar, Tr08 drum machine, and poorly sung vocals
https://blandhistorymp3.bandcamp.com/album/bland-history

Vigenère ciphers, spectrograms, samples of

Mark Gonzales
Ross Ulbricht
Zach Hill
Etc

https://blandhistorymp3.bandcamp.com/album/bland-history

https://www.blandhistory.com/