Sharon Van Etten joined Angel Olsen on stage at Chicago’s Pitchfork Music Festival last night (September 11) – scroll down to watch footage now.The annual festival made its return to the city’s Union Park this weekend (September 10-12), celebrating Pitchfork’s 15th anniversary.Olsen headlined the Red Stage on Saturday and closed out her performance by bringing Van Etten on with her.“This last song, I’m gonna bring out one of my favourite singers, one of the kindest I’ve ever met in the music