According to the Official Album, it was written by Tish Eastman. It doesn't say who the musicians are, but I would assume most of it is synth and done by studio musicians.
Reflections of Earth was written by Gavin Greenaway. He also conducted, and produced it. It was performed by the London Symphony Orchestra and the Royal Philharmonic Orchestra.
And for further trivia - it was recorded at Abbey Studios in London.
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