The band Kings of Leon have made a documentary about their rise to fame, from forming the group 1999 whilst growing up in a strict Pentecostal family.Talihina Sky will premiere at Edinburgh Festival Hall on Saturday 25 June, where the band of three brothers and their cousin will hold a live Q&A via satellite to cinemas across the country.Band members Jared and Matthew Followill spoke to BBC reporter Sophie van Brugen about the film, and why they would love to return to Glastonbury.