David chose singers and instrumentalists that played as Minstrels and singers who were psalmists. Psalmists and Minstrels are prophetic worshippers who are called, appointed and anointed. Worshippers should be born-again and Holy Ghost-filled. These are such that love the Lord and His Word. God is a Spirit and they that worship Him, must worship Him in Spirit and in Truth. Therefore, the Worship of God should be purely spiritual and not carnal or entertaining.
David prophetically by-passed the Tabernacle of Moses and went directly into the Holy of Holies through revelation. Therefore, any true worship should be prophetic because David gathered all Israel and her leaders to consecrate themselves because there was a set order. The Priests were the only ones qualified to carry the Ark. The revelation David had to bring back the Ark of God from the Philistines in 1Chronicles 15:1-29 brings all of us to where worship should be in this dispensation.
Lucifer was the greatest worship leader God made by Himself, to worship Him. He had him wired with inherent qualities that would make for excellence in his function as a worship leader. (Ezek 28:12-15 [NKJ]). If God set the standard of Lucifer so high, God’s standard of worship leading has not changed, even today.