Why are you so good?
A more serious question would be:
do feel like you have the artistic freedom to make whatever you want? If yes, do you think that's what lets you create masterpiece after masterpiece?
I know it sounds trite, but Riot really does care about doing things with a player-first mentality - and the stuff that we've been able to do for music really embodies that.
One crucial truth about music that we've always tried to stick to is the idea that everyone has a deeply personal and specific relationship with it, which you can't really fake. So we always try to approach it from a place of authenticity (ie, "Would I, or someone into this kind of music, listen to that?"), while still tying it to a great experience that only Riot could provide. I don't think things like K/DA would have happened had we done it, genuinely, any other way.