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It's been almost 50 years since New Zealand musician John Hanlon rose to prominence with the release of his iconic song 'Damn the Dam', which was originally recorded as a jingle for an advertisement. The song was adopted by environmentalists as a protest song for the Save Manapouri Campaign. Hanlon is still going strong musically, and about to release his 10th full album featuring 23 songs (whittled down from 40), called Naked Truths.