Now let's not get into the topic if this is rare or not, let's just be amazed by the sound.
This sounds great. And I clearly hear some Zappa-influence in there as well.
And there's loads of this to be found on YouTube.
Too bad that I don't know the name of the band or the music they are performing.
The clip does show a little piece of the back-cover of the record, and it does say "саксофон" or something like that, but that's about all that I saw.