The Dalemark Quartet by Diana Wynne Jones

A quartet of linked fantasy tales set in a divided kingdom, following different young protagonists whose ordinary lives are swept into political intrigue, ancient magic and quests that reveal hidden histories; through music, storytelling and craft—especially rune-like weaving and song—they awaken unexpected powers, confront oppression and tyrants, forge alliances across generations, and work to heal a fractured land while coming of age.

The 17010th greatest book of all time