Get ready to raise your lighters up, here's another video of David Crosby and Graham Nash from their live performance at Zucotti Park in Manhattan yesterday.

You can hear just how thrilled the Occupiers are to have the duo there with them. And if you watched the Countdown video from last night - or caught the show - you can hear the pair get a bit emotional as they talk about how it touched them that the crowd knew the words to their song.

It's a real blast of Woodstock nostalgia. Enjoy.