I recently attended a Hasidic (Lubavitch) funeral in Southeast Asia for a member of our community who was a righteous convert to the Jewish faith. The funeral was attended by members of our expat Jewish community and also by 200-300 non-Jewish children from a local school who were there to honor their beloved English teacher (who hailed from the US). After the interment and recitation of Kaddish, the Rabbi and members of the community drifted away, leaving the school children and their supervising teachers to organize themselves into a choir whereupon, after an interval of about 10 minutes, they began to sing sotto voce a most beautiful lament. Although I can't be sure, I believe the choir sang in Hebrew. How and by whom they were taught this is not yet known to me. However, I just wonder if such an unusual turn of events, especially the choral singing, would be considered "non-Kosher" in a traditional Jewish funeral service.