I like to listen to instrumental music generally, solo instruments (piano, cello) with accompaniment over orchestral. I love instrumental adaptations of pop songs or other music and can listen to those for a long long time... however I do adjust it based on what I'm writing. For example, when writing the chase scene in my current novel I listened to Attack by 30 Seconds to Mars for like an hour on loop XD
Also while I'm here I wanted to plug my collaborator's piano music - I think he makes AMAZING piano covers and originals, and his youtube channel gets way too little love! I actually reached out to him originally just to use one of his songs as background music coz I loved it soooo much, and we ended up collaborating!! Here it is: