when they are singing (at her/his place)
when you [plural] are singing (at her/his place)
when s/he is singing (at her/his place)
when I am singing (at her/his place)
when we (but not you) are singing (at her/his place)
when we (you and I) are singing (at her/his place)
when you are singing (at her/his place)
