Heavy metal in a dream is read as raw intensity and anger finding a safe channel. It can point to power, release and a part of you that refuses to be softened.
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.