Even though I didn't really start attending live theatre regularly until 1983, several 1970's musicals had their influence on me, so I'll start there. I'll give you my 3 favorites for each decade.
Honorable Mention: Applause
2. Sweeney Todd: The Demon Barber of Fleet Street
1. A Chorus Line
Honorable Mention: La Cage aux Folles
2. Grand Hotel: The Musical
1. The Mystery of Edwin Drood
Here is a video made for the song "Don't Quit While You're Ahead" featuring the Original Broadway Cast and writer Rupert Holmes. Love the 80's beat! And Betty, Cleo and Howard look amazing!! (Thanks, Kevin D. for bringing this treat to my attention.) RIP George Rose, a gentleman and a great actor.
Honorable Mention: Sunset Boulevard, Titanic and Side Show
2. Blood Brothers
1. Kiss of the Spider Woman
What were yours? Please write in and share!