The 1972 Toronto production of Godspell with Victor Garber, Andrea Martin, Eugene Levy, Martin Short, and Gilda Radner.
1976 RSC Macbeth with Ian McKellen and Judi Dench, directed by Trevor Nunn.
OBC Sweeney Todd or Gypsy. I would have loved to see Angela Lansbury when she was younger.
If I could revisit something I've seen before, it would be a hard decision. I feel pretty damn blessed. It would be a toss-up between the 1989 RSC Othello (with Ian McKellen, Willard White, Zoe Wanamaker, and Imogen Stubbs), the 2004 LA Opera production of A Little Night Music (with Victor Garber, Judith Ivey, Zoe Caldwell, Laura Benanti, and Kristen Bell), or the pre-Broadway Master Class in Los Angeles (with Zoe Caldwell and Audra McDonald).