Lixy, it is "Whiter Shade of Pale"...hope I've put your mind at rest...& it is one of the all-time killer rock songs, supposedly derived from J S Bach (& one of the 1st songs I learned when I was playing the Hammond regularly)...also great is LedZep's Kashmir...
One I keep going back to when I need that out-of-body experience is Pink Floyd's "Shine On You Crazy Diamond"...

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