One of the more nefarious generalizations of popular musical history is that which asserts a change from ‘modality’ to ‘tonality’ around the year 1600. The old canard is nowadays scarcely met with in its pure form, but it is surprising how much it still influences even sophisticated discussions of tonality both before and after that date. Lowinsky in his epoch-making Tonality and Atonality in Sixteenth-Century Music is largely concerned with the ways in which sixteenth-century music foreshadows the tonal procedures of the baroque and classical periods. In his articles on ‘Tonality’ and ‘Harmony’ in The New Grove, Carl Dahlhaus, while offering a series of widely-ranging definitions of tonality, and while recognizing also the capacity of melody to be tonally organized, nevertheless regards the major and minor scales as the essential pre-requisites of ‘harmonic tonality’, and its growth as a phenomenon of music composed since 1600. I find myself in sympathy only with the wider definitions of tonality there given, principally that of Fétis, and it will be the function of this paper, first, to argue against the retention of narrower definitions, and, secondly, to put the case for recognizing that the development of harmonically controlled tonality occurred much earlier than 1600. A reading of Dahlhaus's articles (which I take to be an authoritative digest of his considered standpoint as well as an informative summary of the points of view expressed by many theorists down the centuries) has also reminded me how much I am opposed to theories of melody and harmony which depend on acoustic absolutes, and to functional theories of harmony, principally that of Riemann, which assert a rigid hierarchy of chords, or fail to recognize the historical development of harmony from counterpoint. Some of these prejudices will surface in this paper, but they are not its primary purpose.