Minstrel's Book - Discord

WHEN by the brook his strain
Cupid is fluting,
And on the neighboring plain
Mayors disputing,
There turns the ear ere long,
Loving and tender,
Yet to the noise a song
Soon must surrender.
Loud then the flute-notes glad
Sound 'mid war's thunder;
If I grow raving mad,
Is it a wonder?
Flutes sing and trumpets bray,
Waxing yet stronger;
If, then, my senses stray,
Wonder no longer.