 Complete the following phrase:  Much of the biographical information on Kuhnau is known from an autobiography published by Johann Mattheson in 1740 in his Grundlage einer Ehrenpforte. Kuhnaus Protestant family was originally from Bohemia, and their name was Kuhn. Kuhnau was born in Geising, present-day Saxony. His musical talents were apparent early, and in around 1670, he was sent to Dresden to study with court musicians there. During the next decade, he studied keyboard playing and music composition, as well as French and Italian. In 1680, an offshoot of the 