Elżbieta Niezgoda

The harp is played by Welsh fairies to an extent unknown in those parts of the world where the harp is less popular among the people. When any instrument is distinctly heard in fairy cymmoedd it is usually the harp. Sometimes it is a fiddle, but then on close examination it will be discovered that it is a captured mortal who is playing it; the Tylwyth Teg prefer the harp. They play the bugle on specially grand occasions, and there is a case or two on record where the drone of the bagpipes was heard; but it is not doubted that the player was some stray fairy from Scotland or elsewhere over the border. On the top of Craig-y-Ddinas thousands of white fairies dance to the music of many harps. In the dingle called Cwm Pergwm, in the Vale of Neath, the Tylwyth Teg make music behind the waterfall, and when they go off over the mountains the sounds of their harps are heard dying away as they recede.

Wirt Sikes

British Goblins: Welsh Folk-lore, Fairy Mythology, Legends and Traditions