Dixit Dominus is a psalm setting by George Frideric Handel, a German, later British, baroque composer who spent the bulk of his career in London, becoming well known for his operas, oratorios, anthems, and organ concertos.
Dixit Dominus is a psalm setting by George Frideric Handel (catalogued as HWV 232). 
George Frideric (or Frederick) Handel ( ; born Georg Friedrich Hndel ] ; 23 February 1685 (O.S.) [(N.S.) 5 March]  14 April 1759) was a German, later British, baroque composer who spent the bulk of his career in London, becoming well known for his operas, oratorios, anthems, and organ concertos. Handel received important training in Halle and worked as a composer in Hamburg and Italy before settling in London in 1712; he became a naturalised British subject in 1727. 
