[quote name='Hot Tub' post='569464' date='Aug 14 2009, 08:36 PM']So, if it's not in the original key (which is the one I know, inside out, back to front, upside down), is it OK to shoot the singer? [/quote]
No. Nobody goes to see a covers band because of the bassist.
Dont think notes, think intervals. Keys become irrelevant, you look good (or at least, competent :-)