Beach Boys co-founder Brian Wilson says he has struggled with mental illness and hallucinations that plague him on stage.
"I'm thinking, 'God help me if I get these crazy thoughts in my head.' I have auditory hallucinations that I get," he said on the TV show Good Morning America.
"Voices saying, 'I'm
going to hurt you, we're going to kill you ... ' You know, crazy stuff."
Wilson, aged 59, said he would always be on medication to treat his condition.
But he's still making music, and was honoured with an All-Star Tribute to Brian Wilson which screened on US television last night.
Ricky Martin, Carly Simon and Billy Joel were among artists taking part.
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Madonna took her adopted home to her heart as she played the first concert on a British tour.
"God save the Queen," she declared to 16,000 fans at Earl's Court in London.
The singer, dressed in a punk-style mini kilt and bondage pants, made her declaration of allegiance as she burst into hit single Beautiful Stranger, three songs into the show.
She had earlier emerged on a dry ice-swathed stage to perform a subdued opening song, Drowned World/Substitute For Love. But the pace picked up as the 42-year-old mother-of-two was carried aloft by 10 dancers to the disco stomp of Impressive Instant.