Beyonce doesn't shake her a$$ during performances of songs like "Me, Myself & I", "Dangerously In Love", "Flaws and All", "Irreplaceable", "At Last", "If I Were A Boy", "Ave Maria", and "Halo". Janet can barely sing, the fact that she can dance is not enough since she's supposed to be a SINGER. Beyonce can do both but singing is the main ingredient and she does so beautifully.