Yeah, that could certainly work. But I think there are other possibilities too... historically, and today, music has played a large part in religion. People sing hymns in church today, the Greeks did the same 2500 years ago, I'm sure other peoples did even earlier. So in a D&D sort of setting, I was imagining a warrior of god, perhaps even a grim faced one, singing a hymn to his god while fighting evil.
For bard-fighters, or bard-barbarians, there's this sort of inspiration, of course...
"Arise, arise, Riders of Theoden
Fell deeds awake: fire and slaughter!
Spear shall be shaken, shield be splintered
a sword-day, a red day, ere the sun rises!
Ride now, ride now! Ride to Gondor!
...
And then all the host of Rohan burst into song, and they sang as they slew, for the joy of battle was on them, and the sound of their singing that was fair and terrible came even to the City." - Tolkien, The Return of the King