Johann Adam Reincken (Reinken, Reinkinck, Reincke, Reinicke, Reinike) (baptized 10 December? 1643 – 24 November 1722) was a Dutch/German organist and composer. He was one of the most important German composers of the 17th century, a friend of Dieterich Buxtehude and a major influence on Johann Sebastian Bach, however, very few works of his survive to this day. Reincken received primary music education in Deventer in 1650–54, from Lucas van Lennick, organist of the Grotekerk (Lebuinuskerk). In 1654 he departed for Hamburg to study under Heinrich Scheidemann, organist of St.