How to thank or praise a talented musician in Hindi?

It can be "नतमस्तक होना", as in - मै आपके सम्मुख नतमस्तक होता हूँ. आपका प्रदर्शन देख कर मै प्रभावित हुआ.
Or one can use बहुत अच्छा/सुन्दर प्रदर्शन! , वाह वाह! or बहुत खूब!

I am not sure if I got the one you were looking for. I guess the first would be closest in Hindi.