The Warlock Rock
written by Christopher Stasheff
published in 1991
A plague of mysterious singing stones have flooded the kingdom, capturing the eyes--and ears--of the good folk of Gramarye, young and old alike. Entertaining, yes. But what exactly ARE these strange, musical rocks? Where did they come from? Why do they have such influence over the thoughts and feelings of everyone who hears them, and to what purpose? Rod Gallowglass intends to see the stones in concert and find out--before his children sell their souls to rock and roll..