Not really sure how I came across this one but from what I've read, Mario's Big Adventure had two separate releases back in 1986. One was a promotional album given to Mario Fan Club members, called Mario's Big Adventure/GO GO MARIO!! and the other which is called Mario's Big Adventuremay have been a promo as well but that I cannot find out for sure.. The albums were created on both cassette and vinyl, sometimes you can catch one of them selling on ebay. The only difference between the two of them is they have slightly different album covers--I included both in our upload--and for "Side B" one album has a song called The Koopa Family's Counting Song(an original song) while the other has a song called GO GO MARIO!!(arrangement of the overworld theme) So, rather than create a seperate downloadable album for only one song, I blended them both.
I was personally surprised to see that Nintendo was releasing promos and even had a Mario Fan Club put together so long ago. I guess that really speaks of the rapid success of the Mario Brothers back then.