'Even the early writings of sympathetic composers like Aaron Copland, Edward Burlingame Hill, Constant Lambert, Darius Milhaud, and Virgil Thomson and of critics like Alfred Frankenstein and Masimo Mila failed to capture the elusive essentials of jazz, or they fell prey to basic misconceptions. For the rest there was an avalanche of derogatory articles and pamphlets by popular writers who fantasized relentlessly over the pernicious influence of jazz on music and morals. Moreover, the statements of many jazz musicians themselves in the early years of jazz encouraged others to treat the subject lightly.
After 1930, however, there appeared a number of books that were not only sympathetic and serious in intent but revealed an understanding of the essential nature of jazz: Robert Goffin's Aux Frontieres du Jazz (1932), Wilder Hobson's American Jazz Music (1939), Frederic Ramsey's and Charles Edward Smith's Jazzmen (1939), and Hugues Panassie's The Real Jazz (1942). But even in these books, a musician interested in learning about jazz as a (musical language [italics]) could learn very little about its harmonic and rhythmic syntax, its structural organization, its textures and sonorities, or what in technical terms made one performance better than another. In addition, these authors were so committed to propagating the absolute primacy of New Orleans jazz that their books were anything but comprehensive.'
(Schuller, G, Early Jazz, pp. vii-viii)