Solved: Old song? 70's perhaps

Ok, I was listening to Pandora and I heard a great song I've done everything I can to find it but I don't really remember the lyrics. I'm almost positive it was older probably from the 70's. I was listening to Pink Floyd on Pandora and it just came on. What I can tell you about the song was that it's long. Definitely over 6 minutes. The singer has a low dark voice and I think castles and the grass being greener were in the lyrics. It seemed sad and moody. I wish I had more to go on but I was kinda messed up and can't remember a whole lot other than i loved that song. Any ideas?

My first association is High Hopes by Pink Floyd.

http://www.youtube.com/watch?v=Bqvcmud3LFQ

Perfect that's it! Can't believe I didn't know it was Pink Floyd. Thank you so much.