Mariah Carey has pledged to leave the Marilyn Monroe piano she picked up at an auction to a museum in her will. The pop superstar spent $600,000 (GBP307,700) on her heroine's white piano and has made big plans for the instrument after her death. She says, "It's in my will that if anything should happen to me, the piano goes to a museum, which is where I think it should have gone in the first place."