The opening chord sequence is the same as the one used in the intro of "Stairway", however it is a very common chord sequence. The Beatles used it in "Michelle" before Spirit, Gentle Giant or Led Zeppelin. Nick Drake used it too, in "Fruit Tree." This is a great, haunting song by the way.
In the great tradition of ripping off lesser known music Jimmy Page shamelessly ripped off the far lesser known an relatively unhearlded Gentle Giant. The rest as they say is history. I wish I had listened to these guys a little more
I want to remember all you the LP of Van Der Graaf Generator "H to He", Who am I? The Only One. On this LP there is formula for nuclear fusion as I taught to Vivasvan (the sun) my disciple milions of years ago and 5000 years ago to Arjuna, new disciple because this science of true yoga was lost. I recommend all you to find this LP.
I would most definitly say so, magloken. This has to be the true inspiration to stairway to heaven or it's just an unbelievable coincidence that just one year later there comes a song that sounds so incredible familiar and has somehow similiar lyrics, but it is of course more mainstreamed for the common listener. nonetheless, I like both songs for their individual qualities.