You can change your power settings to turn the screen off after 5ish minutes and go to sleep after an hour. I find that I do something at least once an hour when listening to Spotify so it doesn't shut off.
Sadly, my first instinct is to reply "yea, buy an iPad". Seriously, if Spotify pushed a Windows app I could probably go cold turkey on one device [well, ok. . add MK X to that and THEN I could go cold turkey]
In lieu of Spotify, I use TuneIn Radio for those times when I wanna just let it play in the background.
TuneIn works great on my Android phone but my problem is that it DOES keep running, even if I try to stop it it doesn't really close unless I kill the process. That and Waze can both cause a big drain.