Thanks, Wordwind! I never knew the musical connotation of crwth! This is from The Folkies' Dictionary on OneLook:

crwth (Welsh, pron. "crooth") also known as "crowd", this is a Welsh bowed lyre used by the bards. Three or four strings in its rectangular frame was common. Illustrations from the 11th century show it, and it's probably much older than that. With the decline of the bardic tradition, it was largely gone by the 19th century. It's all up to the period players now.

And forgive me for not knowing that, Faldagium.