Question: What actor who was in "The Evil" also played the musician Edwin Flagg in "What Ever Happened to Baby Jane?"

Context articles: Victor Buono
Dave Willock
What Ever Happened to...
The Evil (1978 film)
Baby Jane Hudson
David Cerda
Debbie Burton
Lukas Heller
What Ever Happened to Baby Toto?
Psycho-biddy

Victor Charles Buono (February 3, 1938January 1, 1982) was an American actor and comic and briefly a recording artist.
 He was most famous for playing the villain King Tut on the television series "Batman" (1966-1968) and musician Edwin Flagg in "What Ever Happened to Baby Jane?
" (1962), the latter of which earned him Academy Award and Golden Globe Award nominations.
 He was a busy actor from his late teens until his death at age 43, and with his large size and sonorous voice, he made a career of playing men much older than himself.
Dave Willock (August 13, 1909 – November 12, 1990) was an American character actor.
 Willock appeared in 181 films and television series from 1939 to 1989.
 He is probably most familiar to modern audiences from his performance as Baby Jane Hudson's father in the opening scenes of the cult classic "What Ever Happened to Baby Jane?
" (1962).
 He played seven different characters on CBS's "Green Acres" with Eddie Albert and Eva Gabor, mostly portraying clerks or elevator operators.
What Ever Happened to... is a 1991 American made-for-television thriller drama film directed by David Greene and adapted for the small screen by Brian Taggert, based on the novel "What Ever Happened to Baby Jane?
" by Henry Farrell and the 1962 theatrical film of the same name.
 It stars real-life sisters Lynn Redgrave as Baby Jane Hudson and Vanessa Redgrave as Blanche Hudson, in the roles previously played by Bette Davis and Joan Crawford in the 1962 adaptation.
The Evil is a 1978 American horror film directed by Gus Trikonis and starring Richard Crenna, Joanna Pettet, Andrew Prine and Victor Buono.
 It is also known as "House of Evil".
Baby Jane Hudson is a fictional character and the antagonist of Henry Farrell's 1960 novel "What Ever Happened to Baby Jane?
" She was portrayed by Bette Davis in the 1962 film adaptation and by Lynn Redgrave in the 1991 made-for-TV remake.
 The 1962 production is the better-known, with Bette Davis earning an Academy Award nomination for her performance.
 The character is portrayed by Susan Sarandon,who plays Bette Davis, in the TV anthology "Feud: Bette and Joan" aired in 2017.
David Cerda (born June 13, 1961, Hammond, Indiana) is an American performer and playwright based in Chicago, Illinois.
 He is currently the artistic director for Hell In A Handbag Productions.
 His campy, highly theatrical plays have made him an infamous icon within the Chicago theater scene.
 He has written and appeared in a transgressive adaptation of "Rudolph, the Red-Hosed Reindeer", "How ‘What Ever Happened to Baby Jane?’
 Happened" and POSEIDON!
 An Upside-Down Musical which won the New York International Fringe Festival Best Ensemble Award.
Debbie Burton was an American singer.
 She is best known for dubbing the singing voice of the young Baby Jane Hudson (played by child actress Julie Allred) in the 1962 film "What Ever Happened to Baby Jane?
", singing the song "I've Written a Letter to Daddy".
 Burton also sang a duet with Bette Davis, the rock and roll song "What Ever Happened to Baby Jane?"
, written by Frank DeVol and Lukas Heller.
 It was released as a promotional single, with Burton's rendition of "I've Written a Letter to Daddy" on the flipside.
 An instrumental version of "What Ever Happened to Baby Jane?"
 can be heard in the movie.
Lukas Heller (21 July 1930 – 2 November 1988) was a German screenwriter, born in Kiel.
 He won an Edgar Award for Best Motion Picture for "Hush… Hush, Sweet Charlotte" (1964), and was also known for writing the screen adaption to "What Ever Happened to Baby Jane?
" (1962).
What Ever Happened to Baby Toto?
 (Italian: "Che fine ha fatto Totò Baby?" )
 is a 1964 Italian black comedy film written and directed by Ottavio Alessi.
 It is a parody of Robert Aldrich's "What Ever Happened to Baby Jane?
".
Psycho-biddy is a colloquial term for a subgenre of the horror/thriller movie that features a formerly-glamorous older woman who has become mentally unbalanced and terrorizes those around her.
 The genre officially began in 1962 with the film "What Ever Happened to Baby Jane?
" (though it had some antecedents) and lasted through the mid-1970s.
 It has also been referred to by the terms Grande Dame Guignol, hagsploitation and hag horror.
 Renata Adler, in her "The New York Times" review for the 1968 film "The Anniversary", referred to the genre as "the Terrifying Older Actress Filicidal Mummy genre."