When you hear the sound of marching in the tops of the trees, then attack. ¹  For at that moment the Lord is going before you to strike down the army ²  of the Philistines.”

David told the leaders of the Levites to appoint some of their relatives as musicians; they were to play various instruments, including stringed instruments and cymbals, and to sing loudly and joyfully. ¹ 

All Israel brought up the ark of the Lord’s covenant; they were shouting, blowing trumpets, sounding cymbals, and playing stringed instruments.