Interesting question. If you want to become proficient at choosing components that sound great then you want to learn about the high end from Robert Harley’s book: The Complete Guide to High End Audio. This is because the electrical circuits are not really direct insight into how stuff sounds… so much of it is material science, vibration control and proprietary stuff. Correctly choosing and setting up systems is about the dimensions Robert’s book speaks to.
Now if you are just interested in electronic design for fun. Different story… go for it. Just be a bit careful, unless you are choosing really inexpensive components be a bit careful on choosing components by the specific design.