While surfing a few writing boards, one topic that I see appear quite often is the subject of music. Usually it’s someone asking what music a writer listens to while writing, and how it affects them. In other cases, I’ve seen people list a few bands and almost ask if it’s ok to listen to it while writing. My answer has and always will be, if it helps you write, do it!
Neil Gaiman states pretty elegantly in the liner notes to his music cd “Where’s Neil when you need him:” “music was always part of the writing process — different music for different stories.” Brandon Sanderson wrote in in his blog: “Music is a large part of the writing process for me. Listening to particular songs, with particular beats, can really get me into the writing mood, sparking images and ideas in my head. I depend on it in many cases to make me write when, sometimes, I don’t feel like it.” Sanderson, when asked specifically what he listens to, he goes from classical, Metallica, Daft Punk, etc.
Personally, I listen to rock when I want a fast paced scene, and classical or Celtic when I want a softer feel. I try to match the beat to the rhythm of the scene. Look at the music you like and look at your scene. Whichever genre or song you think best matches how you want to write, use it. You don’t need permission, you just need to write!