Searching for a German rock song

For years this song has been shared as a fake Guns N’ Roses leak, but now thanks to a guy called Ray Butch we have a new lead called ‘deadline’ that as he claims, used to be shared on P2P services as being a song from the Chinese Democracy recording sessions.
Now I was able to listen to all the stuff they released and it sounds pretty close. The singer a guy called Marek Jamrozy is for sure the same guy.
Unfortunately none of the songs are the song I am looking for but Ray also mentioned the existence of unreleased demos and apparently he named one called "Oh In The Night" as I wasn’t able to find any official release that contains this track.
Thanks to Discogs I was able to find another band where Marek Jamrozy(the singer) also plays, it’s called ‘Last’ but I wasn’t able to find any of their songs online neither CDs for sale.

I would like to ask if you guys know where could I find this kind of stuff such as the ‘deadline’ demos and the ‘Last’ albums. Is there some sort of German music collecting website or a music sharing service where I could look for this stuff?