The problem with Google Play Music, Spotify and similar services is that you must select the music, which can be incredibly distracting in itself. I like music radio stations better in that regard.

Digitally Imported (https://di.fm) is a fantastic voice-free radio network with over 300 channels/genres [1] for every kind of music (electronic, rock, pop, jazz etc). I use it every day, it's hard to not be productive while listening to their Goa-Psy channel [2].

[1] https://en.wikipedia.org/wiki/Digitally_Imported

[2] https://www.di.fm/goapsy