No, but people still think it is, now this has been mentioned but take Susan Boyle, with a voice like an angel, but since she Is not the perfect sex symbol everyones like "HEY! SHE'S UGLY! But she can sing, let's bring these two points up constantly when we talk about her." So she's essentially the token "ugly" singer.
Now my other point is Janis Joplin, now I am In no way saying she's ugly, but she is not everybody's dream date I would think. But yet she was incredible, amazing In her trade. And It also thinks people who aren't the "epitome of hot" get lopped into the comedy music genre. Great musicians are littered all over the internet, Paul and Storm, Duane and Brando, Jonathan Coulton, ignored by the greater public because they can't get In tight leather jeans or shake that ass on stage. And Ke$ha, a glitter covered doll, and Justin Bieber, a non threatening lanky white boy, gain fame because they have that appeal.