The photo shows a Coast Guard vessel inspecting the piano.
CNN has some pun fun with the story:
Call it the latest piano bar, a large-scale mystery, or a whole new set of Florida Keys.
Anyway, in Miami's Biscayne Bay, a grand piano has appeared -- perched on the highest point of a sandbar.
"We don't know how the piano got out there, we don't know who's responsible for putting the piano out there and at this point it's clearly a mystery," said Jorge Pino of the Florida Fish and Wildlife Conservation Commission.
And for now, it's staying put. Authorities told CNN they have no plans to remove it.
"What will probably happen is that the piano will just disintegrate because of the salt water and the salt air," said Pino, adding that it will not harm the wildlife.