 The project was undertaken by the respected local organ builder Johann Friedrich Wender.Wender's previous work included a two-manual instrument at the New Church in Arnstadt (today known as the Bach Church, with which Bach was familiar as he was employed there before coming to Mühlhausen.The Mühlhausen organ was completed in 1709, by which time Bach had been succeeded as organist by his cousin Johann Friedrich Bach, but there is evidence that Bach returned to the town to inaugurate the instrument.