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The captains of the host — Rather, “the princes” of 1 Chronicles 23:2 and 1 Chronicles 24:6.

THE TWENTY-FOUR CLASSES OF SINGERS, OR MINSTRELS.
Moreover (and) David and the captains of the host. — The…

Moreover, David and the captains of the host separated to
the service
Of singing the …

David put those in order who were appointed to be singers and musicians in the temple. To prophesy, in this place, means praising God with great ea…
Albert Barnes
AlbertBarnes