Matthew Poole and continuators on 2 Chronicles 34:12

12 And the men did the work faithfully: and the overseers of them were Jahath, and Obadiah, the Levites, of the sons of Merari; and Zechariah, and Meshullam, of the sons of the Kohathites, to set it forward; and other of the Levites, all that could skill of instruments of musick .

Or, all these here named, were skilful in Instruments of Musick. Which may be here mentioned, either to their Commendation, that they were fit for, and careful and diligent in this Employment wherewith they were now entrusted, no less than in their own proper Work: Or, to intimate, that as they were skilful, so they were exercised in both their Employments, and did successively oversee the Work, and praised God with their Voices and Instruments for his Gracious and Powerful Help in carrying on the Work.