Because

Style Taylor Swift Last Friday Night (T.G.I.F.) Katy Perry Oops!...I Did It Again Britney Spears thank u, next Ariana Grande no tears left to cry Ariana Grande Paparazzi Lady Gaga Espresso Sabrina Carpenter Teenage Dream Katy Perry Judas Lady Gaga Lush Life Zara Larsson Toxic Britney Spears Maneater Nelly Furtado Pink Pony Club Chappell Roan All The Things She Said t.A.T.u. Locked out of Heaven Bruno Mars The Sweet Escape Gwen Stefani, Akon Love You Like A Love Song Selena Gomez & The Scene Sign of the Times Harry Styles The One That Got Away Katy Perry Telephone - Cover of Lady Gaga feat Beyoncé Glee Cast Style Taylor Swift Last Friday Night (T.G.I.F.) Katy Perry Oops!...I Did It Again Britney Spears thank u, next Ariana Grande no tears left to cry Ariana Grande Paparazzi Lady Gaga Espresso Sabrina Carpenter Teenage Dream Katy Perry Judas Lady Gaga Lush Life Zara Larsson Toxic Britney Spears Maneater Nelly Furtado Pink Pony Club Chappell Roan All The Things She Said t.A.T.u. Locked out of Heaven Bruno Mars The Sweet Escape Gwen Stefani, Akon Love You Like A Love Song Selena Gomez & The Scene Sign of the Times Harry Styles The One That Got Away Katy Perry Telephone - Cover of Lady Gaga feat Beyoncé Glee Cast