Julie, you are sadly ignorant. Many song writers do not sing well. That doesn’t mean they are not fine musicians or composers. Oh, just by the way, many song singers can’t sing. It’s definitely difficult to tell these days with autotune and related electronic voice modifiers.
Jerry Garcia was embarrassed of his singing voice. But fans loved his creative work and did not dwell in the least on whatever singing shortcomings Garcia may or may not have had. What U2 fans ever bemoaned Bono’s poor singing? He has always sung with his heart.
Julie agrees songwriter Bono doesn't sing well: "I love some of his songs . . . but when faced with the awful actuality of his yowling, I remember what Prince once said about him: ‘You know what I’d do with a voice like that? Become a janitor.’" Prince ignorant as well?