It is rather interesting that folks will use King David to justify many things. However, we need to make the distinction that what David did was not part of the cultic sacrificial worship of Ancient Israel. The rubrics mandated by God, the Father, as dictated to Moses, were rather strict. Any deviation from them resulted in severe penalty. One only needs to look at the sons of Aaron and Dathan to know what happened.
This is a long read, but very informative.
liturgica.com/html/litJLitMusDev1.jsp
Summarizing the Mishnah, Idelsohn describes the main musical worship, which — as in the First Temple — was part of the morning sacrifice. “After the priests on duty had recited a benediction, the Ten Commandments, the Shema (Deut. 6:4-9), the priestly benediction (Num. 6:22-26), and three other benedictions, they proceeded to the offerings,” after which, “one of them sounded the Magrefah… the signal for the priests to enter the Temple to prostrate themselves, whereas for the Levites that sound marked the beginning of the musical performance. Two priests took their stand at the altar immediately and started to blow the trumpets… After this performance, they approached Ben Arza, the cymbal player, and took their stand beside him, one at his right and the other at his left side. Whereupon, at a given sign with a flag by the superintendent, this Levite sounded his cymbal, and all the Levites began to sing a part of the daily psalm. Whenever they finished a part they stopped, and the priests repeated their blowing of the trumpets and the people present prostrated themselves.” [13]
So, unless, I have completely lost my reading comprehension skills, it seems that musical instruments were indeed used during ancient Israel sacrificial rites.
I asked for sources for purporting that only chanting of the psalms was used and only got
“you posted from a protestant site” and “I will trust my PV”
Now if you can provide documentation, that your opinion is the correct opinion, we are waiting.