I’ve been given many reasons to ponder the nature of friendship these past months — a most cherished value, to be a good friend. I certainly haven’t come up with anything new or profound, but this song, Sonya Alone, heard at Dave Malloy’s exhilarating electropop opera, Natasha, Pierre and the Great Comet of 1812, says everything I feel about what a great friendship should be, especially a friendship between girls. It makes me ache each time I hear Brittain Ashford sing Sonya’s heartbreaking aria for Natasha. Listen.