From Modes to Keys in Early Modern Music Theory addresses one of the broadest and most elusive open topics in music history: the transition from the Renaissance modes to the major and minor keys of the high Baroque. The system Glarean proposed in his 1547 Dodecachordon comprised twelve modes at two transposition levels; the scheme J.S. Bach used to order The Well-Tempered Clavier in 1722 featured two modes at twelve transposition levels. What took...