Нашел довольно интересную программу, которая позволяет использовать компьютерную клавиатуру в качестве замены клавишному инструменту. Краткое описание с оригинального сайта:

Kreol is software that turns the computer into a musical instrument.

Kreol was created on the assumption that people like to make music. If you are reading this, chances are that you already know how to type and use a computer. By taking advantage of that fact, Kreol breaks down some of the biggest barriers that keep the average person from playing music.

Simply enough, Kreol turns the computer’s keyboard into notes and chords, while the mouse is used for expressive movements. We write out all types of music for Kreol with the letters from the keyboard — so you don’t need to learn traditional musical notation. In addition to playing Kreol with your friends in your home or apartment, it can also be played in online jam rooms.

Unlike other instruments that take years to master, Kreol gives the average person the ability to play real music with real people.