It wasn’t Chopin or even chopsticks, but these piano-playing pals were still a hot number in the 90-degree weather on Coney Island’s boardwalk yesterday.

The trio — (from left) Shannon Mooney, 29, and sisters Miriam and Lila Rambo, 27 and 23 — might be singing a different tune today with a forecast of heavy rain and temps in the mid-80s.

The instrument was one of 88 Sing for Hope Pianos unveiled citywide yesterday. The musical artworks will be available to play until June 16, when they’ll be donated to schools, health facilities and community groups.