Musically, of course. We say "it girl" a lot but I decided to add it boy and it band to make it more interesting as well.

2010
Boy:
Girl:
Band:

2011
Boy:
Girl:
Band:

2012
Boy:
Girl:
Band:

2013
Boy:
Girl:
Band:

2014
Boy:
Girl:
Band:

2015
Boy:
Girl:
Band:

2016
Boy:
Girl:
Band:

2011-2015: One Direction
2013 band: Vampire Weekend
2012 band: Mumford & Sons
2015 band: Tame Impala

2010
Boy: Eminem
Girl: Katy Perry
Band: Lady Antebellum

2011
Boy: Bruno Mars
Girl: Adele
Band: LMFAO

2012
Boy: Flo Rida
Girl: Lana Del Rey
Band: Maroon 5

2013
Boy: Justin Timberlake
Girl: Miley Cyrus
Band: Imagine Dragons

2014
Boy: Sam Smith
Girl: Ariana Grande
Band: Bastille

2015
Boy: The Weeknd
Girl: Taylor Swift
Band: One Direction

2016
Boy: Drake
Girl: Rihanna
Band: Coldplay

2010:
Boy: Justin Bieber
Girl: Kesha
Band: The Black Eyed Peas

2011:
Boy: Bruno Mars
Girl: Adele
Band: One Direction

2012:
Boy: Drake?
Girl: Lana Del Rey
Band: fun.

2013:
Boy: Justin Timberlake
Girl: Miley Cyrus
Band: Imagine Dragons

2014:
Boy: Sam Smith
Girl: Ariana Grande
Band: One Direction?

2015:
Boy: The Weeknd
Girl: Taylor Swift
Band: One Direction?

2016:
Boy: Justin Bieber / Drake
Girl: Rihanna
Band: Twenty One Pilots

I tried to give preference to newer artists