Shania Twain

44 minutes agoBy Mark Savage, Music CorrespondentBBCThe star played a set full of country crossover hits including You're Still The One, That Don't Impress Me Much and Whose Bed Have Your Boots Been Under?"Hats off to you Glastonbury," says Shania Twain, surveying a sea of people - many of whom are, ironically, wearing cowboy hats."I feel and I see your support. Thank you so much for having me."Few artists have…