When thinking of ideas I usually need to somehow picture it in my head and hopefully I can translate that onto paper. Sketching along sometimes helps, or just sitting in a quiet room for long periods of time. I find the time just before sleep to be most helpful. It takes me a while to get to sleep unless I'm very tired, so I will just lay there pondering ideas. Then when I hit the point between dream and reality, some good or just plain weird ideas may occur, or I'll just fall asleep and maybe forget the next day.
So when I finally started to get some images in my head, I was also thinking of what the music might be like, it helps me get in the mood a little better.
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sound: a bell chimes followed by a dragging march
image: a rocket blasts towards a planet
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sound: a bell chimes followed by a dragging march
image: fingers fumble at the rocket's controls/buttons
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sound: a bell chimes followed by a dragging march
image: rocket blasts through the planet's atmosphere
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sound: a bell chimes followed by a dragging march
image: the rocket man holds on
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sound: a bell chimes followed by a dragging march
image: the rocket hits the planet surface
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sound: a bell chimes followed by a dragging march
image: the rocket man leaves the flames of the crash
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sound: a gong hits and fades into whale noises
image: the rocket man begins his journey to explore the planet on foot
. . .

thumbnail: a very small or concise description, representation, or summary: a thumbnail sketch