It can be argued that there were no more famous individuals in the 1970s that Elvis Presley and Muhammad Ali. The former was the iconic King of Rock & Roll, who was still packing concert halls across the world while the latter was the outspoken, political, and supremely talented boxing champion. Suffice to say, the two of them together – with Ali wearing Elvis’s stage robe no less – is iconic image to millions. However, it’s not the only vintage photo featuring Ali and iconic rock stars…