Robert Plant, Saving Grace perform Led Zeppelin classic on 'Late Show'

The British singer and his band Saving Grace performed "Higher Rock," and stuck around for a bonus shot at the Zeppelin classic, "Ramble On." ...
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Watch Robert Plant and Saving Grace perform a stunning version of Led Zeppelin classic Ramble On

Robert Plant lights up The Late Show with Stephen Colbert ...

Watch Robert Plant perform Led Zeppelin’s 'Ramble On' on Colbert

The classic-rock figure also sat down for an interview ...