Mr Queen Guy wrote:
I always thought it was partly lifted from Frankfurt 1979; It has some faint similarities in the instrumentals in the first half. And then the breakdown and the rest is from another show. It's really hard for me to tell, because it is so much overdubbed...
Indeed, it's largely from Frankfurt.
And while there are a few overdubs here and there, it's still nothing compared to the work that was done on The Song Remains The Same and Kiss Alive.