Google Music is like many of the other streaming services. This post will introduce you to some of the free aspects of this service.
The main screen is somewhat similar to Spotify. When you login you are presented with a changing list of stations to pick from. One difference is when you click on a tile you are presented with a few stations to choose from.
*If you are using Google Music in a public setting be mindful of which stations you choose.
To find additional stations start by clicking on the hamburger icon in the upper left corner of the screen. In the pop out menu click Browse stations.
I clicked on Activities and scrolled way down. I selected Working/Studying (Instrumental Music).
This is just a tiny sampling of the stations you could pick from in the instrumental stations.