Simon was performing at the Greek Theatre in Berkeley, California, stopped near the end of one of his final songs to say: “I’m sorry to tell you this way, but Muhammad Ali has passed away.”
An audible sadness passed through the crowd before Simon finished performing the Simon & Garfunkel song.
According to a concert review in the San Jose Mercury News, a hush fell over the audience following the news – making Simon’s final song of the night, “The Sound of Silence,” “seem all that more poignant.”
Ali died Friday at age 74 after spending his final days in a hospital being treated for respiratory trouble.
For much more on Muhammad Ali, see TIME’s ALI: The Greatest, a 112-page, fully illustrated commemorative edition. Available at retailers and at AMAZON.COM