Nowhere was musical instruments authorized by God, it was brought into worship by David, he was not struck dead like Nadab and Abihu, but either way, whether God authorized David to use musical instruments or not, it is not show in the pattern of the NT church, nowhere has it been found used in worship from the day of Pentecost until the catholic church brought it in over a thousand years later.
Okay, David, the chief Psalmist, "a man after God's own heart", was according to you, making "unauthorized" praise music to God that was, it would follow, displeasing to God. I mean no offense to you personally, you are just led not to listen to anything instrumental and I can respect that, but do you really expect everybody to just accept something this illogical (plus the assumption about the worship habits of early church that you actually have no proof of but still presenting it as fact)?