I almost always write with some kind of theme music or inspirational ambient music in the background.
I don't depend on music for inspiration, however, I do remember composing poetry while certain music played in the backround. Since music elicits emotion, I am sure that it did have an effect on the poem's final form and content.
I don't think I can write with out it. Though in the first book, there is a Rave type deal in the ships cantina that was playing music.