What is the short story Lullaby by Elizabeth Berridge about?

"Lullaby" by Elizabeth Berridge is a short story that explores the theme of the supernatural and the power of music. The story follows a young woman who becomes obsessed with a haunting lullaby that she hears in her dreams. As she delves deeper into the origins of the lullaby, she uncovers a dark secret that has been hidden for generations. The story ultimately serves as a cautionary tale about the consequences of meddling with forces beyond our understanding.