You can change the default action associated with the Play triangle icon (the “One Click action”) in the Play preferences settings. See those three horizontal line icons on the right of the list? They are drag handles. You can click and drag (or touch and drag on a Touchscreen device) to change the order of the list. The topmost item is then the default action, as Brian says.
It means that you have three versions of that song (Behind the Mask) in your local library and that there 33 versions available via the streaming service you subscribe to.