2 Chronicles 5:12

and all the Levitical singers , Asaph , Heman , and Jeduthun , their sons and kinsmen , arrayed in fine linen , with cymbals , harps , and lyres , stood east of the altar with 120 priests who were trumpeters ;

All the Levites who were musicians—Asaph, Heman, Jeduthun and their sons and relatives—stood on the east side of the altar, dressed in fine linen and playing cymbals, harps and lyres. They were accompanied by 120 priests sounding trumpets.

Also the Levites which were the singers, all of them of Asaph, of Heman, of Jeduthun, with their sons and their brethren, being arrayed in white linen, having cymbals and psalteries and harps, stood at the east end of the altar, and with them an hundred and twenty priests sounding with trumpets :)