n (number of cases)

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