There are definitely albums that have changed what music means to me.
The Real Thing by Faith No More was the first record that made me think about what I was listening to. Before then, I played GNR and Def Leopard records at home but mostly because I liked the loud, aggressive noise. The Real Thing was different, it was loud and aggressive but there was much more to it and it was the first record I really listened to and started to appreciate and try to understand. Still one of my favourite records now.