I recently discovered Dominic Pedler's "Songwriting Secrets of the Beatles". It is by far the most useful book on pop songwriting I have ever come across - wish I discovered it decades ago, but - better late than never.

https://www.amazon.com/Songwriting-Secrets-Beatles-Dominic-Pedler/dp/0711981671

Please share your favorites...any genre. Though Pop music is my favorite - I love ALL music.

As always - thanks for all your generous sharing.