I don't know if it's particularly creative to dream with a sound track just as I don't know if it's particularly creative to dream in black and white. But your brain is definitely influenced by cinema.
i remember my dreams in full details, like the stage, lightning, color, cast, interactions, dialogs, etc.
but mostly only small part of the whole story
music i often hear either when i fall into sleep or wake up, but also when i play it in the dream like a guitar
also i dream of pseudo-code
yeah, sometimes i wish there was a way to screen-capture my dream, because some of them would make amazing blockbusters (like some dystopian lost worlds)
A weird realization for me is all the events in the dream were produced by me. Yet in real life I'm useless in front of a piano, or a paint brush. It would be great if there was a way to tap into that creativity once awake.
Imagination and technical skill (that is, how well you use a piano or paint brush) are orthogonal domains. The way to tap into your imagination is to develop your technical skill to the level where you're capable of translating what you imagine to the physical motions necessary to convey it on canvas.
i too hear the best music in the world in my dreams
yet after i wake up i forget it instantly
the only thing i remember then is the fact that i heard it, just not exactly what