From ninwiki:
"Green Lines" is the eighth track from The Walled Off Hotel, written by Trent Reznor and Atticus Ross. It was made available online via the official website: http://walledoffhotel.com/media/green-lines.mp3

YouTube Description:
Trent Reznor & Atticus Ross are ‘performing’ nightly at Banksy’s Walled Off Hotel in Bethlehem for the next several weeks. ‘Green Lines’ is a new song written specifically for the player piano in the hotel. If you’re staying there or in the neighborhood, stop by for a drink. http://walledoffhotel.com https://www.youtube.com/watch?v=hxgaIodUpuw