Christian Müller is internationally considered to be one of the most important Northern European organbuilders of the 18th century. The especially impressive organ he built in the years 1735-38 in the Grote of St. Bavokerk in Haarlem has been counted amongst the most famous in the world since its inauguration. The present study focuses on Müller’s life and, in particular, the organs he constructed between 1720 and 1762. Christian Müller was born in 1690 in St. Andreasberg in the Harz Mountains. It is highly likely that he may have studied woodworking with his father and organbuilding with his older brother Caspar and (possibly) uncle, Johann Georg Müller. Another possible teacher may have been the Schnitger pupil Johann Matthias Naumann (1662-1727), who was active in Hildesheim. Christian Müller must have come to the Netherlands around 1716. For a number of years he worked as foreman in the workshop of the Amsterdam organbuilder Cornelis Hoornbeeck (1675/76-1722). In the Spring of 1720, Müller established his own workshop in Amsterdam. Among his early works were substantial rebuildings of the organs in the two Lutheran Churches and the Remonstrant Church in Amsterdam. Each of these projects was, in the first instance, focussed on increasing the organ’s tonal power. Between 1725 and 1728 he built an impressive new organ with 38 stops in the Jacobijnerkerk in Leeuwarden, and a number of smaller instruments in villages in the area. A new organ (in the existing case) for the Walloon Church (‘Waalse Kerk’) in Amsterdam was completed in 1734. In 1735, Christian Müller began work on the construction of the new organ for the Grote of St. Bavokerk in Haarlem, the instrument which was to ensure his worldwide fame. The instrument, with 60 stops, was completed in 1738. During the project’s execution, Müller also built an instrument of two manuals and pedal pull-downs for the Lutheran Church in Zaandam. The most important instruments of his later years were four two manual organs, built for the Lutheran Church in Rotterdam ...