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Under grey, wet skies, this year's 15 finalists appeared on the open air stage on Oulu's central square, twanging, jangling, riffing, screeching and plucking the air.
This year's title was taken by Japan's Nanami Nagura, who performed under the artist name Seven Seas in the contest's 23rd edition.
She started her performance dressed as a modest cleaning lady before transforming into a heavy metal guitarist as her song kicked in. Her prize was a hand-carved guitar called the Flying Finn.
"I'm really, really happy, I can not believe it now!" she said after the contest.
This year's oldest participant Bob Wagner, known as "Mr. Bob", travelled from Canada to celebrate his 75th birthday on stage at the dark horse contest.
"I believe it's their desire to perform and to vent their artistic visions...The Japanese take this quite seriously, training to their heart's content. It's a combination of drive to compete and artistic delivery," assistant producer Anssi Ikonen said.