The good times never felt so good for Metallica’s Boston-area fans at the band’s concert at Gillette Stadium in Foxborough, Massachusetts, on Sunday, August 4. During the show, Metallica bassist Robert Trujillo and guitarist Kirk Hammett had some fun with the crowd, as the rockers treated them to a tongue-in-cheek rendition of Neil Diamond’s classic sing-along hit “Sweet Caroline.”

“Sweet Caroline,” of course, famously has been sung for years by fans at Boston Red Sox games at Fenway Park.

Metallica bassist Robert Trujillo and guitarist Kirk Hammett performed a cover of Neil Diamond‘s 1969 classic “Sweet Caroline” during their concert at Gillette Stadium in Foxborough, Massachusetts, on Sunday (August 4).

Trujillo and Hammett rendered “Sweet Caroline” after Metallica had played six songs, including a version their 72 Seasons track “Screaming Suicide.”

A video shot by a fan shows Metallica frontman James Hetfield telling the audience that Trujillo and Hammett were “gonna entertain you for a moment.” He added, “Have fun.”

Trujillo then announced, “At this point in the show, Kirk and I like to have a jam. So this song is really scary, super heavy, and if you start moshing, try not to injure yourself, ’cause it is such a scary song, I’m already shaking.”

Trujillo sang the classic in a gruff voice, getting the audience to join in with him during the choruses. Hammett added some metal riffs to his generally faithful rendition of the tune.

After the performance, Trujillo declared, “Thank you very much! The heaviest song in the world!”

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