Because I'm an Elvis fan since I was 10 or 11 years old. It started during a vacation. My uncle was singing the first three lines of "Blue suede shoes" over and over again. I asked what it was and he told me it was an Elvis Presley song. When I returned home I ran to the record store and bought my first Elvis Album,"Elvis' Golden records volume 1" and I was hooked... Now 43 years later I'm still an Elvis fan and I'm still collecting Elvis on vinyl.
My favorite Elvis periods are the fifties and the late sixties / early seventies.