I often found real treasures (and for peanuts too!) in my local OXFAM (a charity) second hand bookshop.
Here is one:
J. D. M. Rourke – “A musical Pilgrim’s Progress” (Oxford University Press – 1942). The book traces the author’s musical journey form not being interested in classical music at all, to start enjoying it through Chopin, and then later finding Chopin really cheesy and moving on to Bach and Beethoven. There are some hilarious passages that would make the Chopin lovers cringe in disgust. Sample:
“Chopin is the great detainer: After a certain point he does not open up the pilgrim’s path, but rather stands across it.”
“[…] One works through Chopin. The very lucidity of his music has his reverse side, that one exhausts its possibilities”
“But Chopin’s are not flowers of the field. There is no field they belong to. In a certain novel a man, Jones, is described as ‘having no aura’. What we begin to realise about Chopin’s music is that its aura has no body.”
“Chopin’s music expresses his fantasy life [it] exhibits that sort of compensation-fantasy which drives shop-girls to novelettes about young lords and duchesses, and rule ridden school boys to tales of pirates and crooks.”
Then he goes on to bash other composers as well. Excellent read!

(I will be back).
Best wishes,
Bernhard.