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". I heard from a friend that went there, and knows about music, that these performances aren't 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?