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The group only moved to Auckland from Dunedin early last year, following the success of its debut self-titled album in 2011.
''We're absolutely stoked,'' guitarist Chris Mac said from Auckland.
''It's been an incredible 12 months for us. It feels like we've only just left Dunedin, really, and now we're on our way to Germany.
''We did a European tour early last year and got a fair bit of interest over there.''
Six60 formed in 2006 after University of Otago students Matiu Walters, Ji Fraser, Eli Paewai, Marlon Gerbes and Mac met when flatting at 660 Castle St, from which the band took its name.
''We've still got lots of friends in Dunedin. Our drummer, Eli [Paewai], still lives in Dunedin. Our roots will always be there,'' Mac said.
The band embarks on a North American tour next month and will then return for a New Zealand tour, before moving to Berlin in May.
Six60 plays at Union Hall in Dunedin on Saturday, April 20. The group's self-titled debut album was released in October 2011, debuting at No 1 in the New Zealand charts and going gold in its first week.
The band's move to Berlin coincides with the European release of the album. The signing caps an extraordinary year for the group, which won six Tui New Zealand Music Awards in November, including best group, best single (Don't Forget Your Roots) and highest-selling album (Six60).
Sony spokesman Volker Mietke predicted big things for the band.
''Six60 is a one-of-a-kind band with a remarkable sound and a unique frontman and singer.
''This is how a rock band should sound in 2013,'' Mr Mietke said.
Tickets for the band's April 20 gig in Dunedin are on sale from Monday.