Okay here's the thing I don't get. Lets say I want to write a song about 'Flying thru outer space' or 'Mountains' or 'Goin insane' or anything like that where I can visualize how the song should sound. Thats all well and good but how do I play what I hear in my head. What scales express what emotions. Is there a resource or book or something that says 'you use lydian scales for outer spacey type sounds' for example.
Man this music stuff is hard.