I laughed to myself as I thought what this could possibly mean. Do their flutes shoot out flames of fire? Or do they use tubas as cannons?
While it is humorous to imagine this scenario, I then thought about the fact that everything in our world - perhaps even our music - can sometimes be devoid of mercy. There is a real need for mercy.

We do indeed have a song of mercy, one that was recited by a pregnant virgin in the hill country of Nazareth. This unexpected-yet-expectant mother of our Lord Jesus sang of God's mercy and all the ways God reaches out to save us. For us Christians, especially in a world where there is "music without mercy," this is our song of mercy:
The Canticle of Mary (Magnificat)
Luke 1:46-55
My soul proclaims the greatness of the Lord,
And my spirit rejoices in God my Savior
For He has looked with favor on His lowly servant.
From this day all generations will call me blessed,
The Almighty has done great things for me and holy is His Name.
He has mercy on those who fear Him in every generation.
He has shown the strength of His arm.
He has scattered the proud in their conceit and has lifted up the lowly.
He has scattered the proud in their conceit and has lifted up the lowly.
He has filled the hungry with good things,
And the rich He has sent away empty.
He has come to the help of His servant Israel,
For He has remembered His promise of mercy,
The promise He made to our fathers,
To Abraham and his children forever.