And David spake to the chief of the Levites
 The six before mentioned, ( 1 Chronicles 15:11 ) 
 to appoint their brethren to be the singers;
 before the ark, as they brought it up: 
 with instruments of music, psalteries, and harps, and cymbals;
 which were used in those times, see ( 2 Samuel 6:5 ) ( 13:8 ) 
 sounding by lifting up the voice with joy;
 the instrumental music was to be attended with vocal music, and that very sonorous and loud, and performed with all tokens of inward joy and gladness, as the occasion required.