I am looking for good concerts in Vienna. I heard there are a lot of tourist traps around. Specially from sellers in the street "dressed up as Mozart". Not that the performances are bad but the prices are clearly inflated for what you're going to see.
Of course I could just go to the Opera or any other recognized concert hall but I am looking for smaller and possibly cheaper concert halls with high quality standards.
As far as I know it's difficult to avoid these tourist traps since sometimes they even come listed in the city cultural agenda.
Are there places/websites with reliable information?