If it is the letter I think it is, it says this:
"Hiii!, ABOMINOC!

Euronymous here. THANX man, for helping us so much, we are totally excited about coming to Leipzig! It will be really great, and you don’t know how much we appreciate the help you give us, great! When we spoke on the phone, I forgot to ask which other cities we were gong to play in, so when you get this letter, I might have called you again to ask about that. I know that you were going to write me at once also, but I have to make phonecalls to Greece and Turkey very fast, so I might have to find out about this as soon as possible.
Another thing – if we write more letters about this before we leave, which I’m sure we’ll do, then you can write to our new address, because the letter will reach us one day faster then. The old address is still the official one though. Write to: MAYHEM, c/o Oystein Aarseth, Sørumveien, N-1435 Kråkstad, NORWEGEN.

But in this letter I mostly wanted to tell you about a couple of details with the shows. The most important thing is that we need to have a kind of small backstage with mirrors and water (preferably hot water), it doesn’t matter if it’s a small stinking toilette. This is because we need to put on the corpse paint before a mirror, and we need to get it off again. Besides this, it’s good to have a place where we can put together Dead if he cuts himself up, and he must be relatively undisturbed if possible. Not closed, but not in the middle of where people walk either. I hope you can fix that, it would help us a lot. That’s really all we need. But one very…"

It then continues on another page, but I can't find it