“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.

“The world mourns a genius today, and we grieve for the loss of our cousin, our friend, and our partner in a great musical adventure,” the band wrote on their official Instagram account Wednesday.

Brian Wilson, an eclectic genius whose sunny Beach Boys songs helped define a revved-up era of American popular music, has died at age 82.

Armstrong's rendition is a lovingly faithful tribute.