hard question.
I generally like "chill" music when i write but it varies.
i like working to jazz: coltrane, miles davis, billie holiday, sarah vaughn, pat matheny, etc.
When i'm writing, sometimes i get stuck on a song. I'll listen to it over and over for days or for as long as that piece takes to write. Just the other day, i wrote an entire piece to green eyes by erykah badu. The day before that, nightengale by norah jones. before that push up ya lighter by the roots.
i thought about listing artists or songs but that list starting getting much too long.