Oh my gosh guys, you've triggered the fangirl in me. LZ is my favourite band of all time! I love "When The Levee Breaks" - did you know, the drums were recorded in a small staircase/hallway and there were two microphones, one right by the drums and one a little further off. That caused the echo effect in the song - because of the echo in the small area :) "Ramble on" is probably my favourite ever though!
"There's a feeling I get,
When I look to the west,
And my spirit is crying for leaving"
Except stairway to heaven...a masterpiece.