What's the name of the music? It's really, really good!
At the start of the game, it randomizes two tracks for you. These were part of a humble pack a long time ago, so I'm not sure, but I found the same song on SoundCloud and on the Unity Asset Store: "Muz Station Production" or "MuzStation Game Music" : "Medieval Adventure Ancient". I use Medieval Track #1 and #2.
I like them as well; they fit perfectly, have a good mood, and create a relaxing atmosphere for idling.