Which exclusive bar (also like hotel bars) in Paris offer piano music in the evenings in August?
What is an exclusive bar? Do you mean exclusively piano music or something else? There is a piano bar at https://auxtroismailletz.com/piano-bar/.
Yes, what do you mean by exclusive bar? Do you mean a bar only, no food served, just music? (Thinking of the old-time "lounges".)
I suggest the George V. I was there eons ago. It was wonderful. Piano music and martinis. Elegant, welcoming and classy.
Sorry. I mean a bar where you don't go with sneakers and a backpack. A bar that is a bit more chic, for example, is decorated in the Art Deco style.