Jeff Lynne is a genius, plain and simple...!
His work with George Harrison, Tom Petty, and the Travelling Wilbury's (amongst many) show him to be the torch-bearer of George Martin and the Beatles sound and beyond.
BTW, to get some good inside info and footage of Jeff in the studio, check out the new Tom Petty DVD. A four hour film that I couldn't stop watching! Lot's of fascinating 'in the studio' shots of Tom through his career. Well worth getting...
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An arranger is just a tool. What matters is what you build with it..!