John Gill Commentary 1 Chronicles 16:42

"and with them Heman and Jeduthun [with] trumpets and cymbals for those that should sound aloud, and [with] instruments for the songs of God; and the sons of Jeduthun to be at the gate." — 1 Chronicles 16:42 (ASV)

And with them Heman and Jeduthun, with trumpets and cymbals ,
&c.] Or with them were the trumpets and cymbals, as Kimchi; or, as Piscator supplies it, with them he "left" the trumpets and cymbals:

for those that should make a sound ;
by striking upon them:

and with musical instruments of God ;
sacred ones, such as were devoted to his service, as psalteries and harps; the Syriac and Arabic versions carry the sense of the words quite differently, that these men did not sing with those musical instruments, but with a pleasant voice, and with pure and acceptable prayers, in humility and uprightness, glorified God:

and the sons of Jeduthun were porters ;
at the tabernacle in Gibeon.