It really depends on what the singers genre, country in which they perform in, etc. is.
If you're a female pop singer in my country (United States, the world's most superficially free country) you HAVE to be attractive.
However, if you're a male reggae artist, of course you don't have to be attractive.
If you're a female pop singer in my country (United States, the world's most superficially free country) you HAVE to be attractive.
However, if you're a male reggae artist, of course you don't have to be attractive.