At that time a large trumpet will be blown, and the ones lost in the land of Assyria will come, as well as the refugees in the land of Egypt. They will worship the Lord on the holy mountain in Jerusalem.
I said, “Oh, the feeling in the pit of my stomach! I writhe in anguish. Oh, the pain in my heart! My heart pounds within me. I cannot keep silent. For I hear the sound of the trumpet; the sound of the battle cry pierces my soul!
Blow the trumpet in Zion; sound the alarm signal on my holy mountain! Let all the inhabitants of the land shake with fear, for the day of the Lord is about to come. Indeed, it is near!
If you go to war in your land against an adversary who opposes you, then you must sound an alarm with the trumpets, and you will be remembered before the Lord your God, and you will be saved from your enemies.
It is similar for lifeless things that make a sound, like a flute or harp. Unless they make a distinction in the notes, how can what is played on the flute or harp be understood?