That is, Heman's brother; so Asaph was, as he was a descendant from the same original ancestor Levi, yet in the line of Gershon; and as being of the same office, a precentor, or chief singer:
who stood on his right hand;
he was next to Heman; Heman stood in the middle, which was the most honourable F8, and Asaph on his right hand, and Ethan, after mentioned, on his left; even Asaph, whose name is often met with in the book of Psalms; and his genealogy here stands thus, as traced up to Levi, viz. Berechiah, Shimea, Michael, Baaseiah, Malchiah, Ethni, Zerah, Adaiah, Ethan, Zimmah, Shimei, Jahath, Gershon, Levi.
F8 "Alecto stetit in mediis----", Claudian in Rufin. l. 1. ver. 41. Vid. Barthii Animadv. in ib.