The Modern Commodore 64 - by Payton Byrd.  This is a neat little book that Payton wrote back in 2014.  It would be neat to see this updated for 2023.  Here follows the authors introduction:

The Commodore 64 personal computer is still the best selling model of personal computer of all times. Introduced in January 1982, the Commodore 64 was the successor to Commodore Business Machine's wildly popular VIC-20. The Commodore 64 built on the architecture of the VIC-20, but was not backwards compatible beyond simple BASIC games that did not utilize any hardware-specific features of either computer.

In 1982, the world had never seen anything like the Commodore 64 at anywhere near the Commodore 64's price. The closest thing to a competitor for the Commodore 64 was the Atari 800 which was significantly more expensive and lacked the incredible sound capabilities of the Commodore 64. The heart of that sound prowess of the Commodore 64 is the 6581 SID chip, which to this day makes the Commodore 64 a sought-after machine by the Electronic music crowd as well as modern sceners who create incredible arrangements using a single SID chip. You should really listen to this You Tube video (https://www.youtube.com/watch?v=azgZ5Qw8ass) to get a sense of what sceners are accomplishing on the SID and C64 today.