I brought this book as it is recommended reading for a module of mine at university and I read it the day it arrived seeing as it is a short book. I would say it is reasonable, Rosen's style is readable and he is fairly succinct on some tricky areas. However, I think that some of his opinions are presented rather too much as fact (so read with a cautious mind) and some of the analysis of the function of certain harmonies seems just plain wrong on inspection of the examples in full score. That said this book does raise some interesting questions in the subject of musical aesthetics and as such is a good introductory read to the area. I would suggest that it would be better to borrow this from a library than buy it. It would seem to me that there is very little re-visitable content and the detail is very much lacking.