Computers were never designed in the first place to become musical instruments. Within a computer, everything is sterile - there's no sound, there's no air. It's totally code. Like with computer-generated effects in movies, you can create wonders. But it's really hard to create emotion.
The concept of the robot encapsulates both aspects of technology. On one hand it's cool, it's fun, it's healthy, it's sexy, it's stylish. On the other hand it's terrifying, it's alienating, it's addictive, and it's scary. That has been the subject of much science-fiction literature.