'there are no rules' i'm going to call shenanigans on, because there are. magic isn't a all powerful do all. it has limits, it can't go against science. it can't get you to fly, turn invisible, transform, so on. rules like the threefold law and avoid 'black magic' is a guideline some people ignore.
yes, spirits are real. 'Fantasy' creatures, while i can't speak for all, yes, but on the astral plain, not the physical. same goes for demons and angels. you don't really create your own reality, yes reality is what you make of it, but just because you believe hard enough you can jump from your roof and be unharmed doesn't mean it works that way.
and yes, for some, music can help a lot in meditation. myself, even if it's classical music, i focus more on listening than drifting off.