Arrived today. Sprogs understands music Theory and, a quick flick through random pages, found it littered with errors!
One bit saying a particular interval was 2 tones and another bit saying the same interval was 3 tones. "We've flattened the 7th" showed the diagram wasn't even close! DO NOT BUY THIS BOOK, IT'S SHITE!
I did a One Star review on Amazon and will be returning the book for a refund.