Question about a song played at Woodstock

I wonder if anyone can tell me who's singing the first song on the Woodstock movie Directors Cut (It's the 3rd scene on DVD)
The song begins with these words "there's been a long time comin' it's got to be long time gone". Anyway, the song begins right when you see two red houses on a field and then continues with a scene where four hippies ride horses (you'll see some cows too) and after that the movie shows the people who build the stage.

I hope someone knows the song I'm talking about
I would really appriciate a hand!

peace out!

 

Long Time Gone, Crosby Stills Nash (and Young)

 

Yep, that's Long Time Gone. I saw them do the song live. It's awesome.

 

hmm... i cant even read your writing.

 

Thanks for your help!
By the way, how come you can't read my writing?

 

way to damn small

 

Is this size okey?