The music world is mourning Chris Cornell.

The longtime frontman of Seattle band Soundgarden committed suicide on Thursday, investigators say, hanging himself in a Detroit hotel room after performing a show in the Motor City.

“He’s such a big deal in the rock-and-roll world – so to have seen him last night and to wake up and that’s the first thing you read, it’s sad.”

Sources tell Detroit’s WJBK TV that just minutes after leaving the concert venue Cornell spoke by phone with his wife, and when they hung up, she called Cornell’s bodyguard – saying the 52-year-old singer just didn’t seem right.

By the time the bodyguard got to Cornell, it was too late.

Now Cornell fans are stunned – including in Seattle, where his music helped put the city on the map in the early 1990s.

Cornell was a pioneer in what would become the grunge music scene.

“The idea that he was 52 and a family man and seemingly on an excellent run with Soundgarden being reformed. I think it’s even more shocking.”

Cornell was also known for his role in bands Audioslave and Temple of the Dog.

He is survived by his wife and three children.

“It’s stunning, and it’s really sad. We don’t know the full circumstances of Chris Cornell’s demise, but it’s super sad.”

On social media, a number of rock legends are now paying tribute.

Aerosmith’s Steven Tyler says there’s a new star in the heavens, while Jimmy Page is remembering Cornell as being “incredibly talented” and Elton John said he is “shocked and saddened” by Cornell’s death.