Thomas Hampson and Pavel Černoch have withdrawn from performances of Samuel Barber’s “Vanessa” presented by the Boston Symphony Orchestra and Boston Lyric Opera. As a result, Hampson will be replaced by Patrick Carfizzi. Hampson also took to social media and said, “It is with profound frustration, depression, that I must cancel my week in Boston singing Barber’s ‘Vanessa’ due to {…}