开发音乐程序。提供给用户输入乐谱的窗口，只要用户按照你规定的输入方式输入乐谱（音高和音长），并保存到文件中。音乐程序就可以从文件中读取乐谱并演奏。-Development of music programs. Music available to the user input window, as long as the user provided input as you input music (pitch and duration), and save to a file. Music program can read from the file and play music.