4-6. he appointed certain of the Levites to minister before the ark of the Lord—No sooner was the ark deposited in its tent than the Levites, who were to officiate in the choirs before it, entered upon their duties. A select number of the musicians were chosen for the service from the list (1Ch 15:19-21) of those who had taken a prominent part in the recent procession. The same arrangement was to be observed in their duties, now that the ark again was stationary; Asaph, with his associates, composing the first or principal company, played with cymbals; Zechariah and his colleagues, with whom were conjoined Jeiel and Obed-edom, forming the second company, used harps and similar instruments.