Other than the fact that they are much prettier, is there a main reason why girl singers are praised over male vocalists? Someone once told me in general female vocals are more asthetically pleasing to the ear. But I often find the opposite is true. I do enjoy Patsy Cline and Karen Carpenter, but they are exceptions.

Many female vocalists have their own genre called guess what "female vocalists'. Theres nothing on Last FM that has the category "male vocals". Its just the biased opinion if they sound better, but its not always true.