Photo: Paul Resh (2006 flickr)
Anthony Foss from Philadelphia patents the accordion :

January 13, 1854

Source: Chicago Tribune, 1/13/1989

Håkan Svensson (Xauxa) (Wikipedia)
Highest price ever paid for a musical instrument at an auction:

On May 16, 2006, a 1707 violin made by Antonio Stradivari sold for $3,544,000 at an auction at Christies New York.
Source: Wall Street Journal, 4/12/2007

  Date Apple unveiled the Ipod:

Oct. 23, 2001

Source: Agence France Presse, 10/23/2001

  Amount paid at a New York auction on Feb. 20, 2005 for jazz performer Charlie Parker's saxophone:


Source: The New York Times, 2/21/2005