When did 2010s music start sounding like 2010s music?

So today, I was listening to Kelly Clarkson's 2011 album Stronger. The album sounded like it fit in with a lot of her earlier albums like Breakaway and All I Ever Wanted. The most 2000s song on the album had to be "Standing In Front of You". I looked back at the past decade and wondered as to when 2010s music started to truly define itself rather than sounding like the music of the 2000s.

For me, personally, 2010 definitely sounded very 2000s, but there were some very big things that defined the 2010s that happened that decade (Bruno Mars hits the mainstream, as does Neon Trees, OneRepublic's new album, CeeLo really hitting the mainstream for the first time since his Gnarls Barkley days, etc etc).

2011 and 2012 came closer to the 2010s in terms of music, but still had bits and pieces of 2000s.

I would say that 2010s music really defined itself in 2013 or 2014. By this time, Maroon 5 started straying from rock music towards pop, Katy Perry's album also was way more pop based, OneDirection became the "new Beatles", and many acts made names out of themselves because of their sounds.

This, of course, is my own personal opinion. I'm curious as to when you thought 2010s music strayed from the 2000s to define itself rather than being like a twin brother.