Ben has always felt that he did not fit in his class or in the temple itself, for this reason he always sneaks out of the Jedi temple to the forest to read or be with him and his same feelings. He goes to his favorite place in the forest until he hears a voice, someone singing. Curiosity got the better of him and he went towards the voice watching you singing, clearly you were someone he didn't know

Wow... whisper in surprise and disbelief at seeing this strange person singing