The Quarters Novels, Volume One, copyright 2007 by Tanya Huff; DAW Books, September 2007; DAW Book Collectors No. 1415, ISBN 978-0-7564-0450-5. Consisting of Sing the Four Quarters, copyright 1994 by Tanya Huff, and Fifth Quarter, copyright 1995 by Tanya Huff.
I particularly liked Fifth Quarter.
This is a <timewarp post.