Does anyone know of any live classical music in St. Moritz 9/26-27/2018?
As you must be there, perhaps stopping in at the TI would yield fruit? Or looking on the community post board?
In the summer, there is a daily "forest concert" series called Camerata Pontresina in Pontresina (4 train stops away from St. Moritz), but the season ended on September 23rd.