It's about the music. Sometimes it's about the pretty, but pretty without talent does very little for me in the long run. Music, on the other hand, will take me down all sorts of roads. I can't say if my muse is actually fickle, or just easily distracted - my brain tends to be cluttered (much like my house), and there are times when it becomes hard to sort through.
I have found that music can often help set a certain tone, although certain types of music are better than others at particular times. I have just over 16,000 songs in iTunes right now. It's an extremely eclectic collection - the normal sorts of music are there - the 80's pop, the hard rock, the alternative, but there's also Celtic, Gypsy, classical, country, bluegrass, trance, J-Pop, Monty Python...you name it, I probably have it. (And yes, that would also include a nice selection of Tom Jones. *ahem*)
When I'm writing, I usually just let it play random - words or whatever - it doesn't matter. When I'm editing, I find instrumentals to be better - something mellow (but not so mellow that I fall asleep). Sometimes if I'm trying to evoke a particular concept, I might try to load up a playlist of some sort - I have tracks and tracks of epic trailer music that work out well for battle scenes or love scenes or whatever.
And sometimes I need silence.
In A Brush of Darkness, there are many references to music, both in lyrics and titles, and I've got musicians as side characters. Although some songs are there purposefully, many pieces that I refer to are songs I was actually listening to when I wrote that scene. I guess I like a soundtrack to go with my story, but what's interesting is that I can listen to a particular song that I referenced and I know exactly where I was when I was writing that scene and what I was thinking when I did it.
A strange way to remember things, maybe, but I've found that most of my stronger memories revolve around it.
Of course, my muse also appreciates a good 'O' face.
Just sayin'.
It also appreciates this version of Master of Puppets.
It also appreciates this version of Master of Puppets.