i don´t see how A STAGE can be full of beautiful sounds ? a scene, YES.
All the world's a stage and we are merely players...
The pronunciation is not clear: must it be "tchena" or "shena"?
Maybe '(many) beautiful sounds came from the stage'
I think that “came” is too far from “was full.”
We are translating, not interpreting, and “came” implies that there are listeners someplace outside the stage (maybe in the audience). The original sentence says nothing about this.