2 Chronicles 20:21-22 "And when he had taken counsel with the people, he appointed those who were to sing to the Lord and praise him in holy attire, as they went before the army, and say, 'Give thanks to the Lord, for his steadfast love endures forever.' And when they began to sing and praise, the Lord set an ambush against the men of Ammon, Moab, and Mount Seir, who had come against Judah, so that they were routed."
The background story for this passage is that Jehoshaphat (as a side note, this would be a great name for a cat :) and Judah were about to be attacked by the Moabites, Ammonites, and Meunites, "a great multitude." Needless to say, the nation of Judah, along with their king, were a bit afraid. They fasted and prayed and cried out to God recognizing their inability to conquer the enemy. He heard them and the Lord of angel armies assured them that they would be victorious in battle. When they got up, ready to go out to battle, the king appointed people to sing praise to the Lord. Not only did they sing, but they LED THE WHOLE ARMY! They were claiming victory before the battle even started and were so confident in God's power that they put the singers up front.
I don't know what it sounded like but I like to think of something along the lines of "O Fortuna" by Carl Orff from Carmina Barina. It's a massive choral piece that starts out very terse and soft and half way through the timpani kick in and the chorus goes from pianisimo to fortismo immediately. It's huge and would strike fear in opposition. At the huge part, I think of the angel armies of God rushing forward utterly decimating and destroying the enemy.
Judah then went to gather an enormous amount of plunder for 3 days followed by a time of worship and celebration for God's providence.
I think there's application here for people going through difficult circumstances or seemingly insurmountable obstacles in life. Of course, proper preparation and wisdom is vital but don't get so caught up in the tough spot that you forget who is Lord. Instead of freaking out and worrying to death, praise Him in the moment then go and stride forward claiming victory.
Here's a simple song I wrote based on this passage.
I will praise you Lord in the darkest night
when the battle roars when it's hard to fight
I will praise you Lord when evil comes
when I want to hide when I want to run
I'm gonna praise You, yes I will praise You
The victory is Yours oh God
You are the Lord the mighty One
Salvation comes by Your own hand
and with You, I'll always stand