wiser than all men - that is, all his contemporaries, either at home or abroad.
than Ethan - or Jeduthun, of the family of Merari (1Ch 6:44).
Heman - (1Ch 15:17-19) - the chief of the temple musicians and the king’s seers (1Ch 25:5); the other two are not known.
the sons of Mahol - either another name for Zerah (1Ch 2:6); or taking it as a common noun, signifying a dance, a chorus, “the sons of Mahol” signify persons eminently skilled in poetry and music.