Christ that's an underwhelming trio for me, but would fully understand the rationale if it was them. Would likely see Olivia (even as a middle aged white man who's niece's would be insanely jealous if I did) as she's got some cracking stuff from the little I've heard. Amazing voice and sounds sincere and emotive, lyrically. But the other two do f**k all for me. As we know, all that means is I'd be free to explore the wealth of other acts on show - the best thing about the whole festival, and the very first bit of advice my Glasto-veteran friend gave to me in 2011 when I first went; "don't worry about the headliners or chasing the main acts if you're not actually interested, use that time to explore...".