Tony Bennett joins Billy Joel on stage for EPIC duet of 'New York State Of Mind'

What happens when you put two of music's biggest stars on stage at Madison Square Garden in New York City?

You get an absolutely EPIC duet!

Which is exactly what happened when Tony Bennett joined Billy Joel to perform the Piano Man's 1976 hit 'New York State Of Mind'.

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As the 92-year-old belted out the ode to the Big Apple, the crowd can be heard roaring.

Just imagine being in the audience!