Software that converts whistling or humming into MIDI format

  Most people know how to play one common instrument - the human voice. Imagine software that could convert a person's whistling or humming into MIDI format (or something similar) - recording the pitch, duration, volume, and decay. Once in a format like MIDI, it can be interchanged with a wide range of virtual instruments, allowing you to command an orchestra without ever having to learn how to play a MIDI keyboard.