amy winehouse back to black was both critically and comercially successful so why is it not on the list? it deserves top 20 definetly it is really a piece of art, and i think rated r should of made the list, then replace 4 with dangerously in love and move it up on the list, and change btw with the fame monster. then add shakira laundry service, extend the list also because i think there are too many good female albums to just do 50. add mariah carey to the list also, why the heck they left it off the i don't know.