John Gill Commentary 1 Chronicles 16:4

"And he appointed certain of the Levites to minister before the ark of Jehovah, and to celebrate and to thank and praise Jehovah, the God of Israel:" — 1 Chronicles 16:4 (ASV)

And he appointed certain of the Levites to minister before the
ark of the Lord
By singing the praises of God:

and to record ;
or bring to remembrance; to commemorate in a song the great and good things God had done for Israel as a people:

and to thank and praise the Lord God of Israel ;
for all his benefits, and the blessings of his goodness bestowed on them.