New Revised Standard Version
They and their kindred, who were trained in singing to the LORD, all of whom were skillful, numbered two hundred eighty-eight.

Contemporary English Version
There were 288 of these men, and all of them were skilled musicians.

New American Bible
Their number, together with that of their kinsmen who were trained in singing to the LORD, all of them skilled men, was two hundred and eighty-eight.

Douay-Rheims Bible
And the number of them with their brethren, that taught the song of the Lord, all the teachers, were two hundred and eighty-eight.

And the number of them with their brethren, that taught the song of the Lord, all the teachers, were two hundred and eighty-eight.

under the hands

1 Chronicles 25:2,3 Of the sons of Asaph: Zacchur, and Joseph, and Nathania, and Asarela, sons of Asaph: under the hand of Asaph prophesying near the king. . . .

for song

1 Chronicles 25:1-3 Moreover David and the chief officers of the army separated for the ministry the sons of Asaph, and of Heman, and of Idithun: to prophesy with harps, and with psalteries, and with cymbals according to their number serving in their appointed office. . . .

1 Chronicles 15:22 And Chonenias chief of the Levites, presided over the prophecy, to give out the tunes: for he was very skilful.

1 Chronicles 23:5 Moreover four thousand were porters: and as many singers singing to the Lord with the instruments, which he had made to sing with.

Psalm 68:25 Princes went before joined with singers, in the midst of young damsels playing on timbrels.

Ephesians 5:19 Speaking to yourselves in psalms and hymns and spiritual canticles, singing and making melody in your hearts to the Lord:

Colossians 3:16 Let the word of Christ dwell in you abundantly: in all wisdom, teaching and admonishing one another in psalms, hymns and spiritual canticles, singing in grace in your hearts to God.

1 Chronicles 25:2 Of the sons of Asaph: Zacchur, and Joseph, and Nathania, and Asarela, sons of Asaph: under the hand of Asaph prophesying near the king.

Asaph

1 Chronicles 25:1-4 Moreover David and the chief officers of the army separated for the ministry the sons of Asaph, and of Heman, and of Idithun: to prophesy with harps, and with psalteries, and with cymbals according to their number serving in their appointed office. . . .