 In all, the "Musicalisches Lexicon" defines more than 3,000 musical terms; Walther evidently drew on more than 250 separate sources in compiling it, including theoretical treatises of the early Baroque and Renaissance.The single most important source for the work was the writings of Johann Mattheson, who is referenced more than 200 times.Some further information on Walther can be found in the book "Musica Poetica" by Dietrich Bartel.