Back in the day, Before MTV and VH1, the singers of my favorite music, (hard rock, heavy metal) were all Butt-ugly
Ozzy, Bonn Scott, Joey Ramone, Lemmi none of these guys would ever make the cover of GQ.
As the music video infected er influenced the radio and eventually other media, the front-men eventually got better looking, David Lee Roth, Vince Neil, Jon BonJovi. Some of them were actually good performers others just got by on their looks, and many one hit wonder bands fell by the wayside.
Now the pendulum seems to be swinging the other direction, most of what passes for hard rock now seems to be created by the tattooed and pierced self styled freaks of nature.
Marilyn Manson et al.
But for most of the POP, R&B, Country Western, and more "main-stream" music yes Looks are a must. Yes there will be exceptions but not very many.