Well, a number of different members of the Beach Boys sang the lead part on different tracks - to take a few well-known examples, Mike Love on California Girls and Fun, Fun. Fun; Carl Wilson on God Only Knows and I Can Hear Music; Al Jardine on Help Me, Rhonda; and Bruce Johnston on Disney...
There's another category of performer, those who are technically quite poor singers, for example those who can't hit the notes and barely even try (Lou Reed being an example), but can deliver a song and whose voices have an emotional quality or a wit or a warmth that people like. So while some...