Rock music stands for energy, rebellion and the urge to be loud about who you are. Dream tradition reads it as youthful defiance or a need to break out of constraint.
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.