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The Your Song singer recently completed the U.K. leg of his mammoth Farewell Yellow Brick Road tour with only a few dates left in mainland Europe before he officially retires from touring. It's a trek that has taken him to all corners of the globe, grossing a record $887 million (£698 million). On Sunday, the 76-year-old took to Glastonbury's Pyramid Stage for what may be his final full live U.K. show and was joined by guest stars Jacob Lusk, Brandon Flowers, Stephen Sanchez, and Rina Sawayama…