I never noticed this until today when writing the short story "Midsummer Night's Journey", while listening to music set to play random tracks. As you can see if you read it, the mood changes ( in the story as well as the writing style) along with the musical tracks. I'll list the songs and what moods resulted below.

The Bitter End- Insomnium [ Worrying/contemplation start of story]

Astral Descent - Spektr [Start of "Journey"/NDE]

Right into the Bliss - Kataonia [Start of battle/hopelessness start around middle of story]

Destiny Falls to Ruin - Candlemass [No way out of doom/End of NDE]

Nocturne - Insomnium [Ending of story/attempting to escape fate]

These songs really fit the story I think, and they shaped how it turned out (I wrought this story without any preliminary thinking). I wonder if playing certain songs in a certain order would help determine what kind of story I would write. For example, would playing all downbeaten songs and a few upbeat ones near the end make for a dark story with a good ending? Or vice-versa? I have yet to try this, but this story was so clearly influenced by the music I was listening to, I can only wonder if my thesis will hold true.

Time will tell, I guess.