Hamburg: Geißler, 1749
Public Domain [tag/del]
||Abhandlung von den Pantomimen
||Treatise on the Pantomime
translation may be too literal, but Pantomime has always been a subgenre of the musical theater (several examples of which have been uploaded to this site already; it may make the modern reader think of early silent film music but has had rather more varied accompaniment than that :) ) and Mattheson was both composer and substantial critic.