German organist and composer, son of Hieronymus Praetorius. He studied with Sweelinck, 1601 through 1603, and was appointed organist of St Petri in Hamburg from 1603. He also undertook his father's duties at S. Gertrud after the death of the latter in 1629. He was also a famous teacher. Vocal works include approximately 30 motets and chorals, including nineteen in Melodeyen Gesangbuch (1604) and 10 in Neuer Himmlischer Lieder Sonderbahres Buch (1651). Instrumental works for organ include preludes, Magnificats, and chorals.