Music is one of the most inspirational things out there.
Music can help you get in the mood for just about anything. Depending on the scene I'm writing, I love to incorporate music in the background to set the mood and get me totally entranced with the scene I'm writing.
Rock music or heavy metal is the ultimate best when writing a fight scene or action scene.
Pop music when I'm being silly.
Slow songs for when I'm trying to concoct a love scene, which I find is probably the most challenging to do. Don't know why. I have plenty of love in my life. LOL.
Or when I'm writing dialogue for a particular character, I turn on a song that represents them best and it sets the tone for me to be able to write from within that character. To be that character.
The absolute best writer's soundtrack, especially in the genre I write (urban fantasy) is the background soundtrack to Skyram (the video game). Seriously, it's the greatest. I find I write my best no matter what kind of scene I'm currently writing.
When my husband would turn on the PlayStation and play Skyram, I would instantly open my laptop and wait for the music to begin. It's instant brain stimulation. You need to try it!