Meet Japan's granny idol group Obachaan. They sing, they dance, and they're all over 60 years old. The name literally means granny.

They're on a mission to welcome the world to their city Osaka. Osaka is the site of this year's G20 summit, hosted in Japan for the first time.

Their newest song Oba Funk Osaka went viral with over 85,000 views.

Recording it was a challenge as most of the artists don't speak English at all. The groups producer wrote down the pronunciations and the idols read them as they were written.

Whether they will become worldwide sensations or not, they've charmed local fans.

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