The paper concerns the history of instruments in church of saint Thomas on the basis of archival research. The organs have been present in the church since XVII century until modern day with an interval in the middle of XIX century. In describing the instrument’s role it’s necessary to refer to foundation act presented in the appendix. Some hitherto unknown sources as well as an organ mastery break-through at the turn of XIX and XX century in Galicia (esp. as far as Aleksander Żebrowski is concerned) was looked at.