'Primary' in the Bible

And it was the primary [duty] of the trumpeters and singers to make themselves heard [with] one voice, to praise and give thanks to Yahweh. And when a sound from the trumpets, cymbals, and other instruments of song was raised to Yahweh--for he [is] good, because his loyal love [is] everlasting--then the house, the house of Yahweh, was filled with a cloud.