The bard of King Camorak in the fantasy short story "Carcassonne" by Lord Dunsany, appearing in the collection A Dreamer's Tales, 1910. His songs lead him, the King, and a party to seek the mysterious, legendary city of the title.
And of all the weapons hanging on those walls none were more calamitous to Camorak's foes than was the harp of Arleon. For to a man that goes up against a strong place on foot, pleasant indeed is the twang and jolt of some fearful engine of war that his fellow-warriors are working behind him, from which huge rocks go sighing over his head and plunge among his foes; and pleasant to a warrior in the wavering light are the swift commands of his King, and a joy to him are his comrades' instant cheers exulting suddenly at a turn of the war. All this and more was the harp to Camorak's men; for not only would it cheer his warriors on, but many a time would Arleon of the Harp strike wild amazement into opposing hosts by some rapturous prophecy suddenly shouted out while his hand swept over the roaring strings. Moreover, no war was ever declared till Camorak and his men had listened long to the harp, and were elate with the music and mad against peace. Once Arleon, for the sake of a rhyme, had made war upon Estabonn; and an evil king was overthrown, and honour and glory won; from such queer motives does good sometimes accrue.