1 Chron 16:40 To offer burnt offerings unto the Lord upon the altar of the burnt offering continually morning and evening, and to do according to all that is , which he commanded Israel;
1 Chron 16:41 And with them Heman and Jeduthun, and the rest that were chosen, who were expressed by name, to give thanks to the Lord, because his mercy endureth for ever;
1 Chron 16:42 And with them Heman and Jeduthun with trumpets and cymbals for those that should [SIZE=+1]make a sound[/SIZE], and with musical instruments of God. And the sons of Jeduthun were porters.
The SOUND, in fact, forced NON NATIONAL FUNCTIONAIRIES outside the gates and on their face. When the burning was completed the GREAT SOUND CEASED letting people know that they could go about their business.
H8085 shama shaw-mah' A primitive root; to hear intelligently (often with implication of attention, obedience, etc.; causatively to tell, etc.) X attentively, call (gather) together, discern, give ear, (cause to, let, make to) hear (-ken, tell), X indeed, listen,
After the processional with music in which the ark was brought to Jerusalem it is said:
"The ancient Tabernacle was now divided; the ark was brought into Zion, whereas the brazen altar at least, and probably the vessels of the holy place (ex. 25:23-40; 37:10-28; 40:22-27), were established in the high place at Gibeon.
Asaph and the singers (1 Chron. 6:31-47; 15:16-19; 16:5; 25:6) were left before the ark,while the priests ministered in Gibeon before the Tabernacle (16:39)." (Schofield Bible, p. 478-479).
"The original altar of Burnt-offering continued at Gibeon with the Tabernacle (2 Chr. 1:3, 5). David must have erected a new altar for sacrifice at Jerusalem.
> The sacrifices commanded by the Law were, it appears, offered at the former place (Gibeon);
> at the latter were offered voluntary additional sacrifices." (Albert Barnes, 1 Chron, p. 347).
"The book of Psalms contain new doctrine after the Law of Moses. And after the writing of Moses, it is the second book of doctrine... (David) first gave to the Hebrews a new style of psalmody, by which he abrogates the ordinances established by Moses with respect to sacrifices, and introduces the new hymn and a new style of jubilantpraise in the worship of God; and throughout his whole ministry he teaches very many other things that went beyond the law of Moses." (Fragment of Commentary by Hippolytus, bishop of Rome, Ante-Nicene, V, p. 170)
The truly greak kings always sought to restore the worship commanded by God through Moses. This musical worship would have been private devotion and:
"The absence of instrumental music from the services of the tabernacle continued not only during the wandering of the Israelites in the desert, but after their entrance into the promised land, throughout the protracted period of the Judges, the reign of Saul, and a part of David's. This is a noteworthy fact. Although David was a lover of instrumental music, and himself a performer upon the harp, it was not until some time after his reign had begun that this order of things was changed." (Girardeau, George, Instrumental Music, p. 29).
THAT'S too late to be from the Law of Moses and too early before Christ repudiated it.