Countdown with Keith Olbermann (Current TV's news hour) hosts musicians David Crosby and Graham Nash hours after their inspiring "Occupy" appearance and sing-a-long in Manhattan.

The pair discuss their impressions of the Occupy Wall Street movement with Keith. The duo also performs an original song a cappella.

Graham Nash on observations from a recent tour of Europe:

""We just finished a seven-month tour of Europe. Everywhere we went, they cheered."

... "They're having occupations about the park bigger than the park. To them it's like America is waking up."."

David Crosby on the Occupy Wall Street movement:

"They know the system is set against them. They know that it's a system that just favors the rich people. They know this, and they're standing up and laying their bodies on the line - literally - to do it."

Be sure to have your lighters ready to raise up into the air during the song!