Easton's Bible Dictionary: M. G. Easton, M.A., D.D.

Asaph

Convener, or collector.

1. A Levite; one of the leaders of David's choir (1 Chr. 6:39). Psalms 50 and 73-83 inclusive are attributed to him. He is mentioned along with David as skilled in music, and a "seer" (2 Chr. 29:30). The "sons of Asaph," mentioned in 1 Chr. 25:1, 2 Chr. 20:14, and Ezra 2:41, were his descendants, or more probably a class of poets or singers who recognized him as their master.
2. The "recorder" in the time of Hezekiah (2 Ki. 18:18, 37).
3. The "keeper of the king's forest," to whom Nehemiah requested from Artaxerxes a "letter" that he might give him timber for the temple at Jerusalem (Neh. 2:8).