Looking for best place to take in a concert or opera in Munich(sat-mon nights)/Nurnberg(wed-fri nights)/Salzberg(Tues night). Both under 26, looking for beautiful place, reasonable price???

http://www2.salzburg.info/veranstaltungen_262.htm

This should help in Salzburg

It won't be easy, maybe pick something you like
http://www.muenchenticket.de

Try the National Theater in Munich
www.bayerische.staatsoper.de
Check the schedule. There's often ballet there, not just opera. There was ballet when I went in November, but most of it was great (there was a terrible super-modern piece part that we didn't like, but that was only about 1/4 of the program). The hall is gorgeous on the inside, and has a different colour scheme than your typical state opera house. There are a wide range of prices, from 17 euros up to a couple hundred.

For Nürnberg, try this:
www.staatstheater-nuernberg.de