With re: music, I find I can go to full blown auditory hallucinations with a quiet room and relaxation - one moment you're imagining the orchestra, the next you're hearing it - and when I say hearing I mean it - indistinguishable from being in the pit. The moment you pay too much attention it slips away, like trying to look at a floater in your eye. I have absolute pitch, if it's on any way relevant.
For more reading on this topic I throughly recommend Musicophilia by Oliver Sacks.
I experience similar musical phenomenon, I can even create new, complete songs in my imagination. Though I don't think I have absolute pitch, I play guitar and I can't play what I hear. Or maybe it's because of lack of training, IDK, but I'd really like to bump into some scientific information about this.
I write music mentally all the time, it's incredibly frustrating that I can't transcribe or play anything close in the real world. I'm a guitarist also.
With re: music, I find I can go to full blown auditory hallucinations with a quiet room and relaxation - one moment you're imagining the orchestra, the next you're hearing it - and when I say hearing I mean it - indistinguishable from being in the pit. The moment you pay too much attention it slips away, like trying to look at a floater in your eye. I have absolute pitch, if it's on any way relevant.
For more reading on this topic I throughly recommend Musicophilia by Oliver Sacks.