Once the BBC became involved things changed where headliner performances are now career/genre defining events rather than mere festival "turns". The cultural weight carried by these specific shows differs hugely from other tour dates or festival appearances. I'm all for this, have to say. Bowie's 2000 show, Blur's 2009 show, the Stones in '13 (to name but three) have and will live on into the future as crucial artifacts of an artist's career. All for this.