Brian Wilson originally intended to sing lead vocal on 'God Only Knows' but in the end he sacrificed the lead vocal to his brother Carl: "Well, I thought I was gonna do it. As the song progressed, I said, 'Hey, I feel kind of natural doing this.' But when we completed creating the song, I said my brother Carl will probably be able to impart the message better than I could, so I sacrificed that one. But he had a good time singing it."

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