BTW and Mr. Davies advice are the BEST.
These affairs can be delightful fun.
It is great for the accompaniest to be challenged with NEW unread before sheet music....it is even better to be told...Bd is out of my range could you please move it to F? (Hell, F is so much easier on a tempered instrument)....But sheet in the correct key - whatever is is D#minor - is better than instantainously transposing.
Sincerely,
Gargoyle