Bored-space.com

The appearance of the instrument near Biscayne Bay has prompted speculation that it may have been placed there for a music video, as a romantic date or a marketing stunt. The stretch of coast is just north of the upmarket South Beach area known for its glitzy clubs and restaurants. A local resident, Karla Murray, says she was so intrigued by the mystery that she swam about 200 yards out to the sandbar to investigate. When she got there, she found that the piano was damaged and charred, as if someone had set it on fire, she said. There were no engraved messages or clues.
"I wanted to see it firsthand," said Ms Murray, a 42-year-old professional photographer who wanted to shoot the piano up close. Derek Tolmie, owner of the Water's Edge Cafe says he saw someone playing the piano.
"It looked like somebody was playing the piano and someone was filming from a small boat," said Mr Tolmie, who noticed the instrument two or three weeks ago. It's not clear what will become of the piano. Florida Fish and Wildlife Conservation Commission spokesman Jorge Pino said the agency is not responsible for moving such items and the US Coast Guard won't get involved unless it becomes a hazard to navigation.