by Sarah Anderson and Greg Clark
Each headstone’s epitaph describes a character that died in a musical. The number of crosses indexes into their name, and the letters get ordered by start year of the musical (as indicated by the birth date blank).
The good deed got me to heaven, nice and swift!
(Carousel) 1945 -> W
That fell through when I went to spy on Japan.
(South Pacific) 1949 -> E
Then I ran away, and somehow I died.
(The King and I) 1951 -> L
I was so bad I made most cops quiver!
(Oliver!) 1963 -> L
Fell off a mountain and lost my life.
(Mame) 1966 -> E
That they tried and found me guilty, and put me on the cross.
(Jesus Christ Superstar) 1971 -> S
As the third one happened, I went to my end.
(A Little Night Music) 1973 -> T
Now he’s the name that thousands cheer!
(Barnum) 1980 -> H
I’ve been chosen to go to the next layer, and be reborn.
(Cats) 1982 -> E
But I lost my lover, and died at 31.
(Sunday in the Park with George) 1984 -> A
I stabbed her to save her soul, in a fleeting moment of calm.
(Carrie) 1988 -> T
But it’s my cellmate whom I will most miss.
(Kiss of the Spider Woman) 1993 -> R
Then I died, a victim of AIDS.
(Rent) 1996 -> E
The indexed letters spell WELLES THEATRE. Orson Welles founded the Mercury Theatre and voiced its radio productions, so the final answer is MERCURY.