Be honest. Let me know if there are any flaws with the disc, you can expect the same from me. I like to trade fairly fast, nobody likes to wait around for new music. Don't use generics, I usually use Sony. Grading scales are relative, I don't let it concern me too much. If there is a problem with a disc I'll list it. In some cases I don't know the source of the music, my thought is if it sounds good it's not neccessary to know.? Although I don't trade any MP3's.? I'm usually up for a trade so drop me a line!