I usually (well, often) write to music. I’m also poor, and of a character that prefers to respect people’s intellectual property. So, while I don’t often buy music these days, I also don’t pirate it.
Which means I listen to rather a lot of Creative Commons licensed music. And public domain.
And to get myself posting semi-regularly, I hereby inaugurate Writing Music Mondays, where I bring to you an album each week that I am writing to, or have used in the past for that purpose. There will be varying styles, as I am eclectic, but it should all function reasonably well in the background as you go exploring your stories.