Chenaniah the head Levite was the director of the music because he was highly skilled.
Preparation is here made for the bringing of the ark home to the city of David from the house of Obed-edom. It is here owned that in the former attempt, though it was a very good work and in it they sought God, yet they sought him, not after the due order, Ch1 15:13.
Commenting on 1 Chronicles 15:1-24
And Chenaniah chief of the Levites was for song,.... But the chief for the song were Heman, Asaph, and Ethan; rather for the burden, as the Targum; for the lifting up and bearing the ark: he instructed about the song; or about the taking up and bearing the burden, the ark; directing when to take it up, and how far to go with it, and...
Chenaniah, chief of the Levites--He was not of the six heads of the Levitical families, but a chief in consequence of his office, which required learning, without regard to birth or family. instructed about the song--He directed all these bands as to the proper time when each was to strike in or change their notes; or, as some render the passage, "He led the burdens...