A classical piano concert poster featuring two female pianists. The design should be elegant and sophisticated, with a grand piano as the central focus. The background should have subtle lighting and musical notes, using a color scheme that reflects the classical music theme, such as deep blues, golds, and silvers. Include the concert venue, date, and time in artistic fonts. The overall design should emphasize the refined and serene nature of the event. --ar 5:7 --s 750