Harry Styles co-wrote this song. He explained in a video that his inspiration for this tune was Paul Simon's iconic 1986 album Graceland..
"I'm a big Paul Simon fan and I think the inspiration behind it was Graceland, in which the verse was so conversational, informal and it's like spoken word," Harry said. "It's quite casual and I love that album and when I listen to it I love hearing the influence from that in this song. I really love the song."
Mike Campbell from Tom Petty & the Heartbreakers played the slide guitar on "Sixth Avenue Heartache." There is a connection here - Wallflowers lead singer Jakob's dad, Bob Dylan, played with Tom Petty in The Traveling Wilburys.