I think the first factor is the music. I think the second is...

I think the first factor is the music. I think the second is their individuality. And I really think the third was that if you take their music today, and you played it to an audience that never heard of the Beatles, and played their 20 or 30 best songs, the music would be as fresh today as it was in 1970 or 1966. It's timeless.