The Riddle and the Rune

From Author Wars - https://authorwars.com/publications/the-riddle-and-the-rune-46161.html

Overview:

Title: The Riddle and the Rune
Author: Grace Chetwin
Year: 1987
ISBN-10: 0027183122
Publisher: Bradbury Press
Price: $13.95
Pages: 257
Binding: Hardcover
Type: Novel
Title Reference: The Riddle and the Rune
Notes: Cover artist on back flap in abebooks.com photo; very blurry but seller identifies him in the details. There are 6 unnumbered pages of sheet music after the novel ends per 2nd printing on Archive.org. LCCN on copyright page, 87-10284, is not on the LoC site.