Well for us geologist type people, or those that have taken a class or two, we know that country rock is more than just country + rock.
So what is it?!
But it is the older rock which has pieces of igneous rock intruded into it. Around the igneous rock the country rock gives the look of being metamorphosed - that is only because it was heated in that area heavily upon the rocks intrusion.
A great example in USA is called Devils Tower in Wyoming.