don't worry about bad english. you probably speak better than most of my classmates (and i live in america!).
as to opeth, well, it's generally pronounced oh-peth, with a long "o" sound and a short short "e" sound (like "get"). the "th" sound is pronounced in the modern english way (the airy, lispy sound).
really? oh well, its deffinately oh-peth (with the lisp as thingy said)
Mikael says it like that live so... ''hello we are Opeth...''
best has to be ''hello we are Katatonia from Sweeden'' i swear Jonas was shitting himself or something like he didnt know what he was doing, maybe high...