I take your statement and raise you one La Rouxkonor77 said:it certainly helps especially in the case of women
In answer to the question, no, musicians don't have to be attractive physically to be successful, though I guess it can help a fair bit. In reference to my La Roux statement, the singer in the duo, Elly Jackson, is fairly ugly (no offence to her). La Roux are also one of last year's biggest new UK acts, and are tipped to be massive in the years to come. So there's a disproof for you right there