Bob Dylan mingled unrecognised with wide-eyed tourists on a £16 bus tour to John Lennon's childhood home.
The music legend went unnoticed as he strolled around the modest 40s semi where the Beatle grew up with his aunt Mimi and uncle George.
And he lingered "enthralled" in the bedroom where John wrote some of the Fab Four's earliest hits.
Dylan - in Liverpool as part of his worldwide tour - told the house's curator that Lennon's simple upbringing was similar to his own.
He pored over photos, documents and other memorabilia inside the property in the Woolton area of the city.
A spokeswoman for the National Trust, which owns and maintains the house, said: "We couldn't believe it when his agent rang us and asked if we could get Bob on one of our tours to see John's house. He spent ages going through photo albums and was thrilled at all the memorabilia.
"He's definitely the biggest celebrity we've ever had on our tours. "But incredibly no one else recognised him."