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About 250 people, mostly girls aged between 10 and 15, queued outside George St clothing store Hallensteins from 1pm to have their posters, clothes and CDs signed by the band's six members.
Zac Taylor, Andrew Papas, Jordi Webber, Shaquille Paranihi-Ngauma, Haydn Linsley and T.K. Paradza were chosen from about 500 hopefuls who auditioned recently for the band.
Put together by The Edge radio station, Titanium was in Dunedin to perform at Otago Boys' High School as part of a nationwide promotional tour.
Female fans cried, others shook with excitement and some rejoined the queue in an effort to meet the singers a second time.
Almost every fan pulled a camera phone from their pocket and asked Titanium members to pose for photographs, which they did.
There were too many hugs to count.
Dunedin 14-year-old Tayla Anderson started crying while waiting in line to have a poster signed.
Overcome with emotion, she said all the band members had "amazing" voices but Zac was her favourite.
"It's so great there is a Kiwi band like this," she said.
Titanium's first single, Come on Home, debuted at No 1 on the official New Zealand singles chart on September 17. The band performed its second single, Sky, at last night's concert.
Titanium is based in Auckland, but the members hail from Whakatane, Auckland, Rotorua, Hamilton, Palmerston North and Wellington.