With their brethren - i. e., “with others of the tribe of Levi.” Each son of Asaph, Jeduthun, and Heman, was at the head of a band of twelve skilled musicians, consisting partly of his own sons, partly of Levites belonging to other families 1 Chronicles 25:9-31. The 24 band-leaders, together with their bands, formed a body of 288 persons (24 x 12 =288) Besides these, we hear of there being above 3,700 singers, who were probably divided, like the trained musicians, into 24 courses, which must have contained about 155 each 1 Chronicles 23:5.
Related Commentaries of 1 Chronicles 25:7
1 Chronicles 25:7
7 So the number of them, with their brethren that were instructed in the songs of the LORD, even all that were cunning, was two hundred fourscore and eight.