In 2016, Elton sang Parker Millsap's praises after catching him live in concert.
That led to a friendship between the young singer-songwriter and the pop veteran. Parker went on to perform Don't Let The Sun Go Down On Me and his own The Very Last Day with the pianist at the Apple Music Festival at the Roundhouse later that year.
"I've gotten to hang out three times with Elton in London," Millsap recently told the Chicago Tribune.
"Every time is kind of surreal at first. I think to myself, 'What am I doing here?' Yet every time it's comfortable. Elton's a sweet dude. He always talks about his sons, his husband and his album collection. He's a real music head who gets pumped listening to music. It's inspiring to see that you can do music for all those years and not be jaded. Elton still feels the songs."
It's an attitude that Millsap and his bandmates hold fast to in their own shows.
"We have a very real belief that every show is its own unique organism," he says. "Every night is a different group of people in the audience and their energy is mixing with ours. We're trying to capitalise on that rather than be afraid of it. We want to take that unique energy of the night and channel it into the songs."