12 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.

Read 2 Chronicles 5:12 Using Other Translations

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:)
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;
And the Levites who were musicians—Asaph, Heman, Jeduthun, and all their sons and brothers—were dressed in fine linen robes and stood at the east side of the altar playing cymbals, lyres, and harps. They were joined by 120 priests who were playing trumpets.