After three Broadway revues of Stephen Sondheim's music you would think a fourth wouldn't offer anything fresh, have any surprises, or be anything special. Think again. "Old Friends" began life as a London gala backed by the composer's friend and producer Cameron Mackintosh, following Sondheim's death in 2021 at the age of 91. That led to a fully realized commercial production in 2023, which became a hit in London wi…
