1 Chronicles 6:44 - Joseph Benson’s Commentary on the Old and New Testaments

The sons of Merari stood on the left hand The children of the next son of Levi are here mentioned, who had the lowest place assigned them, because they were of the youngest family. So there were three principal singers, who were masters and governors of the whole choir: Heman, descended from Koath, was the prime, who, together with his sons, stood in the middle: Asaph, descended from Gershom, with his sons, stood on his right hand: and Ethan, (called also Jeduthun, 1 Chronicles 9:16; 2 Chronicles 35:15, and in the title of divers Psalms,) descended from Merari, on the left.