A Japanese girl group that mixes heavy metal riffage with pop choruses has confused the heck out of Americans with their US television debut.

Babymetal, who have racked up millions of views on YouTube with the frenetic genre-mashing of songs like Karate and Megastune, made their US debut on The Late Show with Stephen Colbert overnight.

The three teens performed their biggest hit Gimme Chocolate!! complete with a band dressed as ghosts and ghouls while performing choreographed dance routines.

Colbert warned viewers beforehand: "I'm not sure what I'm about to see. But I'm pretty excited about it!"

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While Babymetal have been in action since 2010 and released two albums, many viewers failed to share in the presenter's enthusiasm.

Some seemed downright confused about what they were seeing.

Others were more enthusiastic.

Babymetal consists of three singers Su-Metal, Yuimetal and Moametal. Their second album Metal Resistance was released on April 1.

- nzherald.co.nz