After silencing a heckler (who possibly didn't understand Mustaine's announcement about Cornell), he continued: "We have lost one of the most lovely voices in rock history, and I don't even know what to say other than that we're going to dedicate this next song to you, our friends in Tokyo, because we're here with you and we want to celebrate Chris' life".
TRIBUTES HAVE BEEN pouring in from some of the biggest names in rock and roll for Chris Cornell, who died suddenly at the age of 52.
KEXP, Seattle's popular independent radio station, paid tribute to Cornell all day.
It also turns out that Cornell and Soundgarden had been working on a new album.
Chris Cornell of Soundgarden committed suicide on Wednesday.
Cornell was born and raised in the city and was part of a close-knit group of artists who formed the foundation of what would become the grunge scene that exploded in the early 1990s by combining the bombast of early 1970s heavy metal with the aggression and attitude of punk rock.
"He was a huge influence, one of the greatest singers ever to come out of Seattle, maybe the greatest single voice", said Charles R. Cross, a Seattle-based music journalist and author who knew Cornell personally.More news: Bella Hadid, Emily Ratajkowski show leg at Cannes
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"I don't even know what to say". If I were only doing acoustic tours I think there'd be audience members saying 'I wish he'd go play in a loud band again.' Everyone can just relax and enjoy both things. "We don't know the full story".
His songs such as Fell On Black Days and The Day I Tried to Live appeared to touch on his darkness, but Chris Cornell would play down deeper meanings that listeners heard in his lyrics. "But it's a devastating loss".
As previously reported, the late star was found dead in the early hours of Thursday, May 18, after performing for a sold-out crowd at Detroit's Fox Theater. The band had reunited in 2010 after years on hiatus.
Cornell was roommates with Andrew Wood, lead singer of the Mother Love Bone, who died of a heroin overdose in 1990.
He eventually became a Grammy victor with Soundgarden, formed in 1984 and coming out of the rapidly growing Seattle music scene, which included Nirvana, Pearl Jam and Alice in Chains.
The band, which had released hit songs and found success, marked a mainstream breakthrough with "Superunknown", its 1994 album that won them two Grammys, sold more than five million units in the USA, and launched five hits, including "Black Hole Sun", one of the most popular alternative rock songs from the 1990s.