Computer generated star Akikoloid and backing dancers
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3D stars sing and dance on stage in Japan

27 October 2011 Last updated at 22:16 BST

Japan's newest singing and dancing stars are computer-generated characters, created using voice-synthesising software.

Megpoid and Akikoloid have become household names after hitting the charts.

At the Digital Contents Expo, in Tokyo, they even interacted with real dancers for the first time in a 3D stage performance.

Eric Camara reports.