The answer is still Gaga to me, she can do a lot and she has done a lot of different things. Just to name a few:
Bubblegum-pop - Eh Eh (Nothing Else I Can Say)
Country - You & I
Dance-pop - Poker Face
Dance - Judas
Disco - Disco Heaven/Hair
EDM - Stache
Electronica- The Edge of Glory
Electropop - LoveGame
Funk - Beautiful, Dirty, Rich
HipHop - Chillin'
House - Bad Romance
Industrial - Highway Unicorn
Jazz - The Lady Is a Tramp
Mariachi - Americano
Opera - Government Hooker
Pop-metal - Electric Chapel
R&B - 3-way (The Golden Rule)
Rock - You & I
Synth-pop - Just Dance
Techno/Trance - Heavy Metal Lover
Trap - Cake (Like Lady Gaga)
Urban - Out of Control
I love you! 