The Champlain Trio, from left: Letitia Quante, Emily Taubl and Hiromi Fukuda Six pandemic-endangered performance venues are the settings for "Empty Stages: Performances and Stories of Resilience," a mini-documentary series created earlier this year by Vermont filmmaker Jay Craven. The riveting performers on those stages are the members of the Champlain Trio, a year-old Vermont chamber group. In one moment that occurs in the final episode, pianist Hiromi Fukuda, seen in profile, cuts a glance toward cellist Emily Taubl and violinist Letitia Quante. They're playing the second movement of Felix Mendelssohn's Piano Trio No. 1 in D Minor. As the music slows, all three musicians, absorbed in the emotion of the piece, move in unison toward the next phrase.