I worked briefly at KVRO in the early 80's (public radio/OSU) and I remember we used to get in promotional LP's all the time.
One day I came into work and all the DJ's and most of the staff were in a booth listening to this new record that had come in. So I jumped in to listen to it as well. Musicianship was incredible (found out later that Prince had done every single instrument, from drums to guitars to piano, etc.) but to say it was "out there" content wise, particularly for that time was an understatement. I don't remember it completely, but I remember the one track starts off talking about God and ends up seguing into about how much he want's to F some girl and how he loves f'ing her and on and on. Obviously, there was no way we could play that on the radio.
There were only 4 tracks on the LP, but I remember that quality wise the music itself was amazing. Kept thinking that we would eventually hear more from the guy down the road. Given that all the tracks contained "objectionable" material, the program director said that anyone who wanted it could have it and we ended up having to do a drawing to determine who got it, as about 8 people immediately jumped in requesting it. Unfortunately, I was not the winner... I'm certain it would be a major collectible as it was never released commercially.