Поможете точно перевести пару предложений с русского на английский?

No, one guy from Russian  fan-site has written music - it the guitarist.
Then, it has mixed the music with Freds acapella. Whence undertook drums in a step - I and haven't understood.
Probably,he has a whole group ,which has written music to this acapella, or it has applied any program to add drums

Как-то так.

No, van guy from russia fan sayt write musicu - he gitarboy. After that, he MIXED musicu with Fried akapella