David spoke to the chief of the Levites to appoint their brothers the singers, with instruments of music, psalteries and harps and cymbals, sounding aloud and lifting up the voice with joy.
The detailed description here of the ceremonies that accompanied David's bringing the ark to Jerusalem was the Chronicler's way of emphasizing the importance of that event.  "The bringing of the ark into Jerusalem brought about a permanent centralization of the religion of Israel within Jerusalem."[2]