[Jensson]

If you generate the music yourself you can tune it any way you like. Using 440 hz as the basis lets you still do any kind of music, people wouldn't notice the difference since you mostly hear how it changes and not absolute pitch.

> Sitar for example, sounds very different and I believe its because they don't follow that practice

They still follow the same practice, maybe they don't center it on 440hz but the concept of tones and how far the steps between them are is the same all over the world, they just use different scales.