Man recording a concert on cassette, Poland, 1980s

In communist Poland some things you could only hear and record live, because that was harder for censors to stop. Even then there were censors backstage crossing out forbidden lyrics from the sets. However they would often get ignored as an act of defiance, especially at punk rock concerts.

But there was no way to officialy distribute these kinds of materials and doing so could land you in jail.

So unless you had some kind of underground source, your best bet would be to go to a concert and record it.

Just in case you’ve never heard of bootleg recordings:

https://en.m.wikipedia.org/wiki/Bootleg_recording