發送短信 : Recognition of piano notes

  _____     ______   _____       ___      _  _   
 / ____||  /_   _// |  __ \\    / _ \\   | \| || 
/ //---`'   -| ||-  | |  \ ||  | / \ ||  |  ' || 
\ \\___     _| ||_  | |__/ ||  | \_/ ||  | .  || 
 \_____||  /_____// |_____//    \___//   |_|\_|| 
  `----`   `-----`   -----`     `---`    `-` -`