Billy Joel once sang about his "Baby Grand."  Now he's auctioning off one.

The Rock and Roll Hall of Famer has teamed with CharityBuzz.com to sell a Steinway and Sons Baby Grand piano, which Joel will personalize and autograph once the auction has concluded.  When last we checked, the top bid was $20,500 but the reserve had not yet been met -- the piano's estimated value is 60 grand.  The auction ends April 2.

Proceeds from the auction will benefit two charities: the Amy Winehouse Foundation, which helps support young people in need; and Ten O'Clock Classics, which brings classical music to a wider audience by providing music lessons and free instruments to New York City school children, as well as staging concerts in non-traditional venues.

Meanwhile, in other "Billy Joel selling stuff news," the Piano Man's mansion on Miami's La Gorce Island is still on the market after a year, because he won't budge on the price, reports the Florida-centric website GossipExtra.com.   The 9,000-square-foot home with sweeping waterfront views is listed at $14.75 million, and dropping the price isn't an option, the listing agent told the website.

"A lot of people took a look," said agent Jorge Uribe, "including Miami Heat players.  But it's a unique house for a unique buyer.  Potential buyers are folks with a net worth of $100 million."  Billy's in no hurry to unload the place, though.  "He really enjoys the house," Uribe said, "and he is very patient."

Copyright 2013 ABC News Radio