The Tony Award for Best Revival (Play) has only been awarded since 1994. Prior to that, plays and musicals were considered together for the Tony Award for Best Revival.
The award is given to the best non-musical play which has already appeared on Broadway in a previous production.
... Grateful Dead", they became the de facto resident band of Ken Kesey's Merry Pranksters[?], with the early sound heavily influenced by Kesey's LSD-soaked Trip ...