Would be very nice to have Lionel at Roskilde, his gig in Falconer last year was so crazy expensive that I gave up getting tickets.
Any type of music fits at Roskilde! Lionel Richie became relevant with the youth again last year after Adele re-did his "Hello" song.
Also from Wiki: On June 28, 2015, Richie played to an appreciative 100,000 – 120,000 audience at the Glastonbury Festival, England. His show was described as "triumphant" by the BBC and was followed by his return to the top of the UK albums chart with a reissued compilation album of his work as both a solo artist and with the Commodores.
BBC article here "Glastonbury 2015: Lionel Richie draws festival's biggest crowd":http://www.bbc.com/news/entertainment-arts-33305940
And this video from Glastonbury 2015 could easily be Orange in 2016:https://www.youtube.com/watch?v=krZu4wjNLu8