The song is "Brother Louie" by The Stories...

Link:

http://www.superseventies.com/sw_brotherlouie.html

I always liked that tune...

Wow, must have been a one hit wonder?  Yea, I love both of those songs.
Thank you very much.  We are going to play that one in the variety band I play with.
                                          Nutty

From Wikipedia:

"Idiomatic use
The term Rosetta Stone has become idiomatic as something that is a critical key to a process of decryption or translation of a difficult problem. For example, "the Rosetta Stone of immunology" [5] and "Arabidopsis, the Rosetta Stone of flowering time (fossils)".[6]

Another example is the Unix rosetta stone[7] which places similar commands from different dialects (and offspring) of Unix side by side. It is very helpful if one has a solid knowledge of one dialect of Unix and needs to quickly find out how a common task is performed on another.

"Rosetta Stoned" is the name of a song on the album 10,000 Days by the American Progressive Rock band Tool.

The term has been appropriated by United States company Rosetta Stone (software)."

Historically it's an old piece of stone that had writings from several now-defunct cultures-Egyptian (two types-hieroglyphic and demotic) and Greek...

It was explained, but I'll put it into my own words:

I was making a playfully sarcastic remark (since your question was concisely answered in reply 1) referring to your saying how a relatively popular tune sounded like one that, and I say this as a 70s music enthusiast despite my 27 years, remains obscure despite its hitting #3 on Billboard.  Usually, the order is something like, "That guy singing 'Suspicion' sounds just like Elvis!", rather than "The guy who did 'Kentucky Rain' is a dead-ringer for Terry Stafford!".  My analogy has a couple of inconsistencies, but I hope you get the idea.

That such a rare tune was used to compare (and it does have a similarity, mind) is something I find refreshingly amusing.

BTW, I have to admit that I prefer Terry Stafford's version of "Suspicion".  Elvis's version sounds way too much like an outtake whereon the musicians were experimenting.