Many people claim to have experienced supernatural phenomenon, but Robbie Williams has a chilling — and tuneful — ghost story to top them all.

In an interview with Jo Wood’s “Alien Nation” podcast, the “Angels” singer revealed he had a spectral encounter with a dead celebrity — in the allegedly haunted house that inspired Dan Aykroyd to write “Ghostbusters”.

As Williams, 45, tells the 64-year-old Wood (a.k.a. ex-wife of Rolling Stones guitarist Ronnie Wood), he rented Aykroyd’s house while in L.A. for a few months, and found the place to be “completely and utterly haunted.”

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The five-bedroom Hollywood mansion was once home to Mama Cass Elliott of The Mamas and the Papas, who passed away at age 32 in 1974, and Williams believes he was visited by her spirit.

When the group’s hit “California Dreamin'” was played TV show he was watching, Williams says the entire atmosphere in the home changed, resulting in a “silence I’ve never experienced before or since.”

Adding to the mystery, Williams says he discussed his experience with Zak Starkey, son of Ringo Starr, who lived in the house as a child when the former Beatle owned it.

According to Williams, when Starkey learned where he was staying, he asked, “I hear you’re at the old house. Have you met the kids yet? We used to play with them when we were little.”

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In fact, Williams found it difficult to leave when the workers he’d hired to help him move out refused to go inside after seeing “the old lady sitting in the chair.”

As the Daily Mail reports, Aykroyd has long believed the house to be haunted. In a 2003 interview, he recalled feeling someone climbing into bed with him — who wasn’t his wife Donna Dixon.

“I’m sure it’s Mama Cass. You get the feeling it’s a big ghost,” he said. “I had several experiences. I saw things moving around on our counter, and doors opening and closing. The staff also had experiences, direct contact in terms of tactile touching, and then turning around and there’s no one there.”

You can listen to Williams’ interview below: