Because I have not heard a better album since Lady Gaga released this album on May 23, 2011.
It's spawned some of her greatest hits including Judas, The Edge of Glory, You and I, and Born This Way. It's also home to some of her most critically acclaimed tracks by fans and critics alike including Bloody Mary, Scheiße, and Heavy Metal Lover.
It incorporates so many genres including:
pop
synthpop
dancepop
house
electrohouse
Mariachi
techno
high energy
electric rock
pop/rock
etc.
It also incorporates the Spanish and German languages.