"Noisy crowd"
I think a lot depends on the noise.
I find it quite nice that once in a while the pool players wander through to have a listen or the drunken lad is singing along.
But sometimes the muso's are far to precious and sulky about how much attention is being payed to them.
Of course much of the noise can be coming from yer fellow performers,and if you just decided that you should play in a local pub on dominoes night, or seem to be trying to take over "their" local
you do get resistance.
Now if you have a room set aside for aconcert or just for a singaround tell em to shut the f*** up!
I find a simple honest aproach works.