[foresto]

The first time I saw something like this was in a music-focused virtual world from the 2000s. Strangers would strike up conversations with each other, dance (in some cases to well-known artists), wander around to see what others were doing, and generally just hang out.

I think it was called vSide.

https://en.wikipedia.org/wiki/VSide

[doublerabbit]

Cokemusic was another one.

Same platform of Habbo Hotel but sponsored by Coca-Cola.

https://en.wikipedia.org/wiki/MyCoke

[giancarlostoro]

Habbo coincidentally added their own "Trax" furniture that allowed players to make music, similar to how Coke Studios used to allow you to do so.