She looks at you in an exasperated manner - "are you trying to get yourself killed”?
Don't you know jazz is considered to be degenerate and un- German?
“It's a good job no one is listening and that I know who you are". Consider yourself reproached and very fortunate!

She hands you a locker key. 

To keep your cover, and to kill some time, you buy her another drink and have an advocat yourself.

​The barman seems to be paying you a lot of attention - finally he asks you if you like the Kandinsky hanging on the bar wall?