Common Ground is about how hard life is, how man struggles to get through it, as the lyrics suggest. So we need to learn - as what "So get busy learning" wants to get to us. But as time fades, we will all be forgotten, oblivion, for short. So, that's it, I think. Hope I helped.
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Kodaline's Common Ground song tells us that life is not easy and everybody needs to be strong. Whatever you do in this life time will come that you will be forgotten, all that you did and you did not will be forgotten by the people so you need to keep learning because by the time that people will be tired eyeing on you and your life, you only got yourself at the end of the day. So you need to be brave and be strong.
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Life's is all about moving forward not moving backward....