From 1670, he deputized for cantor Andreas Zöll in Jena and married his daughter the following year.

The cantor's students sang it every week at Gastorius' door, on his request, as well as when they returned home.

Gastorius had requested that the hymn "Was Gott tut, das ist wohlgetan" be sung at his funeral.

Gastorius is also credited with composing music for the funeral motet Du aber gehe hin bis das Ende komme.

It was sung at the funeral of the Jena professor of medicine Johann Arnold Friderici on 2 June 1672.