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While some are novice singers and karaoke bar enthusiasts, many come from the entertainment industry, where they work as actors, dancers or fledgling musicians.

Mr Zuckerberg, she says, did not get up before midday, loved karaoke and did not like to be beaten at board games, such as Risk.

The effect is like karaoke only with a live band, original material and professionals who can really sing, such as Summer Nicole Greer, who serves as the Voice of the People.

After dark, cocktails flow for the dating crowd and the karaoke lounge gets busy.

Currently on tour in Australia, he's been loosening up, gently leaning into the softer image he's spent recent years trying to toughen, even performing an intimate karaoke bar set of early sultry hits.