A melody that stays with you after waking is read as a feeling that has found its shape. Tradition sees a sweet tune as inner harmony and a haunting one as something still unresolved.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.