Rare Willie Nelson album - trying to identify it

I've inherited a Willie Nelson LP that I am trying to identify, just get some background info on it, maybe some history - seems it was recorded live, at one point a person can be heard speaking indistinctly while Willie is still singing - It's heavy vinyl I think (much heavier than anything I'm used to, and I collect Blues records) It has a white label that says "Columbia Recording Studios" across the top, then "Reference Recordings," an address in Nashville, and choices with little boxes - all of that is printed onto the label - then it is stamped in red "c. 1976 CBS, INC."  And finally, in pen, handwritten "WILLIE NELSON SIDE 1" the "stereo" box and the 33 RPM boxes are checked - same on side 2 - "WILLIE NELSON SIDE 2"   There are no other numbers scratched into the vinyl, no paper of any kind, and it is in a blank record sleeve. 
Can anyone suggest something, or maybe even an educated guess?  Is this some kind of singular recording, or a promo of some kind? The fact that voices can be heard talking in the background kind of throws me - it seems that would exclude it from distribution of any kind.
Any help would be truly appreciated
Cheers,
Maudie