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This week marks the 60th anniversary of the classic kids puppet sci-fi series. But what makes the groundbreaking show and it's iconic theme tune so endearing after so many years? Ludlow's Dr David Etheridge is musician, teacher and music journalist who has recently completed a thesis on Barry Gray's Thunderbirds music. David tells Â鶹Éç Radio Shropshire's Adam Green what makes Thunderbirds so special.