his brother: Asaph is probably called his brother, because he was of the same tribe as Heman; or, perhaps, because he was his companion or associate.
Asaph: 1 Chronicles 15:17-19, 1 Chronicles 16:7, 1 Chronicles 25:2, 1 Chronicles 26:1; 2 Chronicles 5:12, 2 Chronicles 20:14, 2 Chronicles 29:13, 2 Chronicles 29:30; 2 Chronicles 35:15; Ezra 2:41, Ezra 3:10; Nehemiah 7:44, Nehemiah 11:17, Nehemiah 11:22, Nehemiah 12:35, Nehemiah 12:46; Psalms 50:1, Psalms 73:1, Psalms 74:1, Psalms 75:1, Psalms 76:1, Psalms 77:1, Psalms 78:1, Psalms 79:1, Psalms 80:1 *titles Psalms 81:1, Psalms 82:1, Psalms 83:1 *titles