Bests & Worsts Reviews from Amazon

pp. 28-29: "One of the several notes we call A has a frequency of 55 Hz and all other notes called A have frequencies that are two, three, four, five (or a half) times this frequency." This is simply wrong. The other notes called A are 110 Hz, 220 Hz, 440 Hz, 880 Hz - that is, you double (or halve) frequencies to produce octaves. The author claims to know music and science and yet gets this basic fact of musical science wrong? p. 60: "Think of 'Twinkle, Twinkle Little Star,' written by Mozart when he was six years old." It was not written by Mozart, it is a French song called "Ah! vous dirai-je, Maman." Later in life (not in childhood), Mozart composed some variations on the song, as did many other composers. I read a book to learn something new. But if I see mistakes about things I already know, how can I trust the author about things I don't know? Mistakes this elementary, moreover, raise the question of editing. Did no one with a basic competency in music read this book before it was published? Did Keith Lockhart, who surely knows the relationship between frequencies, read the book before he wrote - or signed - a blurb for it?