Brian Wilson, Beach Boys cofounder and 'God Only Knows' genius ... "He changed the goalposts when it came to writing songs and shaped music forever. A true giant." John Stamos, who has been performing with the Beach Boys, also shared an emotional tribute ...

John Stamos, Nancy Sinatra and John Cusack were among the celebrities paying tribute to musician Brian Wilson after his death was announced Wednesday. Wilson's family announced the Beach Boys founder had died in an Instagram post on his account.

“Brian Wilson was always so kind to me from the day I met him,” John said. “He sang ‘Someone Saved My Life Tonight’ at a tribute concert in 2003, and it was an extraordinary moment for me. I played on his solo records, he sang on my album, The Union, and even performed for my AIDS Foundation.”