A rare Banksy artwork, hand-painted by the elusive street artist and owned by musician Mark Hoppus, is set to go under the hammer at an auction with an estimated price of up to $6.35 million.

Entitled “Crude Oil (Vettriano),” this piece is Banksy’s interpretation of the 1992 painting “The Singing Butler” by Scottish artist Jack Vettriano, whose recent passing was mourned within the art community.

The artwork portrays Vettriano’s original scene of a butler serenading a dancing couple on a beach, with Banksy’s controversial twist of including a sinking oil liner and two individuals in hazmat suits handling a barrel of toxic waste in the background.

The painting, bought by the co-founder of pop-punk band blink-182 Hoppus and his wife Skye in 2011, is being offered at Sotheby’s London “Modern & Contemporary Evening Auction”, with an estimate of $3.81 million – $6.35 million.

“It was first exhibited in (Banksy’s) landmark exhibition in Notting Hill in 2005, which really propelled him into the public sphere,” Mackie Hayden-Cook, specialist, contemporary art at Sotheby’s, told Reuters.

“It’s rare for a work of this quality to come to market, and this one really has all the best ingredients. A fabulous owner, it’s hand-painted, impeccable exhibition history, and its subject is more urgent now than ever before.”

Speaking before news of Vettriano’s death, she linked Banksy’s decision to re-imagine his work to the parallels between the two artists at the time.

“Like Banksy, you have a really, really popular artist that is loved by the masses and appreciated by many. But for whatever reason, he was snubbed by the art world,” Hayden-Cook said.

Hoppus said part of the sale proceeds would go to medical charities and the California Fire Foundation, following the Los Angeles wildfires.

He and his wife also intend to buy new art.

“Coming up in punk rock, it was always the ethos that if your band got any success, you brought your friends up with you,” he told Reuters on Sunday.

“So with this art sale, I hope to take some of the money and put it back into the art community with up-and-coming artists that we’re inspired by and just continue that…I want to be a punk rock Medici.”