If you are a Stephen Sondheim fan, like I am, there are a number of terrific tribute albums-
The "Sondheim: A Musical Tribute" 1973 concert featured a star-studded cast, including Angela Lansbury, Larry Blyden, Alexis Smith, Chita Rivera, Jack Cassidy, and Donna McKechnie, among others. The concert was a benefit for the American Musical and Dramatic Academy and the National Hemophilia Foundation. It was later released on record, showcasing highlights of the event. Members of the original companies--including Angela Lansbury, Chita Rivera, Dorothy Collins, Alexis Smith, and Donna McKechnie, just to name a few--as well as Sondheim himself singing "Anyone Can Whistle" from the piano (From Amazon).
Stephen Sondheim's Old Friends is a tribute revue honoring musical theatre composer and lyricist Stephen Sondheim devised and produced by Cameron Mackintosh. Originally designed as a one-night performance, the revue premiered at the Sondheim Theatre in London on 3 May 2022. The line-up included Michael Ball, Petula Clark, Judi Dench, Daniel Evans, Bonnie Langford, Damian Lewis, Julia McKenzie, Bernadette Peters, Clive Rowe and Imelda Staunton (Wikipedia).