German composer. He studied with his father and with Christian Prusse, Kantor of the church in Burg, before becoming court organist at Gottorf in 1632. There he may have studied organ with Johann Heckelauer. On September 29, 1641, he was appointed organist at the Marienkirche, Lübeck, where he remained until his death; his son-in-law Buxtehude succeeded him. In addition to his duties as organist, Tunder arranged evening concerts (Abendmusiken) consisting of German organ music and Italian vocal works. His surviving compositions include seventeen vocal works (motets, solo and chorale cantatas, sacred arias), fourteen organ pieces (preludes, chorale fantasias, chorale variations), and a sinfonia for strings. His chorale cantatas mark the beginning of the Lutheran church cantata's evolution, and his organ preludes (arranged toccata-fugue-postlude) influenced those of Buxtehude.