Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A nice overview with stuff to bring you back frequently

Had this book for several years and keep opening it up for the breath of intelligent simplicity that breaks me out of bad habits I might be developing. Contains excellent gems about not overwriting, about keeping clarity of line, about writing realistically. Also has a thousand handy charts and diagrams on such things as part-writing, vocal ranges, counterpoint, basic instrument techniques, basic brass voicings...Should not be the only book you own...but might be the only one you pack on a vacation where you mean to get a little composing in.