Lyric discussion by TheEndIsNear 

Since it was so early on in Rush's career, the song was probably taken from several other sources. (Styles like The Who or Led Zeppelin would have used.) People were actually calling the radio when this came out thinking that they had heard fresh Zeppelin material.

I don't believe it's a cover, however.

Great song nonetheless. Put Rush on the map. =]

An error occured.