Bill Murray is a big fan of Miley Cyrus, he told audiences at Comic-Con.
"I thought she was just a knucklehead crazy girl, the kind of girl you would go on a road trip with," he said.
But, now, he's a believer.
"She's really good," he said.
Murray's been on a bit of a music tear lately, hanging with singer/songwriter Jenny Lewis at the Grateful Dead's farewell shows in Chicago this past weekend. The two rocked out to the Dead songs with people including Woody Harrelson.
He also said he's fond of the electronic band XX, which he saw "accidentally" in Nashville once.
In his upcoming film, "Rock the Kashbah," he plays a washed-up music manager who finds a new talent in Afghanistan.
He might star in some of the biggest nerd classics of all time, but Bill Murray had never been to their ultimate convention.
That changed early Thursday when the actor strutted through the massive Hall H, marking his first appearance at San Diego Comic-Con to promote his upcoming film "Rock the Kashbah."
The Deep Purple song "Smoke on the Water" blasted on the speakers while Murray high-fived the screaming audience members on his way to the stage.
Murray stars as a washed-up music manager who discovers a young talent while stranded in Afghanistan.
"I'm rock `n' roll," Murray said. "That's what I am."
The film is directed by Barry Levinson and co-stars Bruce Willis, Kate Hudson and Zooey Deschanel. It is scheduled to hit theaters Oct. 23.