First of all, this is a book on traditional folk music as sung by old Arab Israeli guys written by two Jewish Israeli authors. Never mind that, it is a fascinating study of every conceivable melodic detail that would put any person to sleep in the quickest of minutes. For those interested in comparative studies of Western and Arab folk music, it would be a great footnote in an equally pedantic dissertation.
The methodology, however, seems flawless. Cohen and Katz squeeze every conceivable ounce of musical detail out of what sound to be very simple, very boring melodies. I read it to understand Palestinian music better, but have ended up much more confused than before.
It also makes a nice, expensive collection to a book shelf, where it will be staying in my apartment for a very long time.