The guitar played by Kurt Cobain for Nirvana’s breakout 1991 single “Smells Like Teen Spirit” video has sold for $4.5 million at auction, the sellers said.

The 1969 Fender Mustang Competition Lake Placid blue finish electric guitar was expected to fetch a more modest $600,000, said the seller, Julien’s Auctions. But Indianapolis Colts owner and CEO Jim Irsay plunked down a lot more, not least of all because a chunk of the proceeds will go toward benefiting awareness of mental illness. Cobain shot himself in 1994. “I am thrilled to preserve and protect another piece of American culture that changed the way we looked at the world,” Irsay said.

The left-handed guitar was Cobain’s favorite. In his final interview with Guitar World, he said: “I’m left-handed, and it’s not very easy to find reasonably priced, high-quality left-handed guitars. But out of all the guitars in the whole world, the Fender Mustang is my favorite.”

Cobain’s family is using Mental Health Awareness Month as a springboard and will donate a portion of the proceeds from the guitar and other items to the Irsays’ mental health awareness organization, Kicking The Stigma.

“Smells Like Teen Spirit” put Nirvana, the group Cobain fronted and which kicked off the grunge era, on the map as it became a Generation X anthem and influenced the rock scene for years.

Other iconic music collectibles sold at the Julien’s auction included Madonna’s 1984 “Material Girl” music video ensemble. Inspired by Marilyn Monroe’s “Gentlemen Prefer Blondes” pink outfit, Madonna’s getup and accessories went for $287,500. Bruce Springsteen’s handwritten “Born to Run” lyrics sold for $44,800.