From publisher blurb: An idyllic cove harbours deep secrets. Magic and sound are entwined harmoniously, while dark things lurking in the depths rise to explore new avenues through previously locked portals. Adventurers will be changed as they explore the depths of the Undertower, unlock strange musical puzzles, and reveal the glorious treasures of the Isle of the Plangent Mage. A fantasy adventure of sonic wonder for characters of 3rd to 5th level. 64 keyed areas, village description and NPCs, rumour table, loot summary, dungeon background info. Keyed in a quick-reference, bullet point format. Statted for Old-School Essentials (B/X), usable with any vintage adventure game.