Johann Nicolaus was the eldest son of Johann Christoph Bach and the most noteworthy musician of that line. He was also the uncle of Maria Barbara (Johann Sebastian's first wife). He visited Italy at about the turn of the century and later entered himself into the service of the Danish army where he commanded the fortress at Aggershuus in Norway. After his military career, Johann Nicolaus served as University and town organist in Jena where he lived for fifty-eight years. Although not much of his music survives, Johann Nicolaus established a solid reputation as a composer of organ music, suites and masses. He was also well known as an instrument maker (especially harpsichords and organs). Nicolaus was an admirer of the Italian style, and his music is reminiscent of Antonio Lotti's.