Question: What English lyricist wrote the lyrics for the Doug Henning inspired musical Merlin?

Context articles: Percy Greenbank
The Magic Show
Don Black (lyricist)
Joseph Saulter
Sands of the Nile
Origami (magic trick)
Merlin (musical)
Doug Henning's World of Magic
Ramona Brooks
Tony Slydini

Percy Greenbank (24 January 1878 – 9 December 1968) was an English lyricist, best known for his contribution of lyrics to a number of successful Edwardian musical comedies in the early years of the 20th century.
 His older brother, lyricist Harry Greenbank, had a brilliant career in the 1890s that was cut short by his death at the age of 33.
 Percy picked up where his brother had left off, writing lyrics for some of the most popular musicals from 1900 through World War I and even afterwards.
The Magic Show is a one-act musical with music and lyrics by Stephen Schwartz and a book by Bob Randall.
 It starred magician Doug Henning.
 Produced by Edgar Lansbury, it opened on May 28, 1974 at the Cort Theatre in Manhattan, and ran for 1,920 performances, closing on December 31, 1978.
 Henning was nominated for the Tony Award for Best Featured Actor in a Musical and director Grover Dale was nominated for the Tony Award for Best Direction of a Musical.
Don Black, {'1': ", '2': ", '3': ", '4': "} (born 21 June 1938) is an English lyricist.
 His works have included numerous musicals, movie themes and hit songs.
 He has provided lyrics for John Barry, Charles Strouse, Andrew Lloyd Webber, Quincy Jones, Lulu, Jule Styne, Henry Mancini, Michael Jackson, Elmer Bernstein, Michel Legrand, Hayley Westenra, A. R. Rahman, Marvin Hamlisch and Debbie Wiseman.
Joseph Saulter is an African-American musician, actor and video game designer.
 He is the co-founder of The Urban Video Game Academy and is currently the president of the DeKalb Council of the Arts, chairman of the Diversity Advisory Board at the International Game Developers Association and a full-time faculty member at the Art Institute of Atlanta in the field of audio production.
 Saulter is also the CEO of Entertainment Arts Research which is the first African American-owned 3D video-game development company in the United States.
 Saulter is probably best known for his work as a Broadway actor and musician.
 His Broadway credits include "Hair", "Jesus Christ Superstar" and "I Love My Wife" for which Saulter won a Drama Desk Award.
 Saulter also wrote the Drum book for Doug Henning's Broadway hit "The Magic Show"."
 Saulter is a professional jazz drummer and still performs today.
Sands of the Nile, also known as Hindu Sands or Sands of the Desert, is a popular magic trick performed since the early part of the 20th century.
 It was a staple of Doug Henning's stage and television shows.
Origami is a magic stage illusion with a Japanese paperfolding theme, designed by Jim Steinmeyer.
 It was originally performed in 1986 by Canadian illusionist Doug Henning, using a working prop constructed by illusion builder John Gaughan.
 Illusionist David Copperfield later introduced presentational changes that would be widely copied by other performers.
Merlin was a musical based on a concept by popular illusionist Doug Henning and Barbara De Angelis, written by Richard Levinson and William Link, with music (and incidental music) written by Elmer Bernstein and lyrics by Don Black.
Doug Henning's World of Magic was the first of seven annual prime-time television specials starring magician Doug Henning, which aired live on NBC Friday, December 26, 1975.
 Bill Cosby was the show's special guest, along with Gene Kelly (who introduced the special) and musical guest Lori Lieberman.
 The show ran live without commercials under the sponsorship of Mobil.
Ramona L. Brooks (January 8, 1951 – June 2, 2014) was an American singer and actress.
 A member of Lady Flash, Barry Manilow's backup group, she sang on his 1975 Album "Tryin' to Get the Feeling".
 She also performed on Lizzy Mercier Descloux's 1979 album "Press Color".
 Tom Spahn was her vocal coach.
 Her 1977 solo single "Skinnydippin" hit 94 on what is now the Billboard Hot R&B/Hip-Hop Songs chart, and "I Don't Want You Back" reached 55 on the U.S. Dance Club Songs chart in 1981.
 On Broadway, she appeared with Doug Henning in "The Magic Show" at the Cort Theater, and with Billy Dee Williams in "I Have a Dream", at the Ambassador Theater in 1976.
 Her brief movie career included appearing as "Hooker #1" in the 1980 Frank Sinatra vehicle The First Deadly Sin and as "Hooker #2" in 1983's "Vigilante".
 Her brother Paul Stubblefield was the drummer for the 1970s Cleveland Jazz/Funk group Sounds of Unity and Love, her cousin is Hammond organ player Ike Stubblefield.
Tony Slydini (September 1, 1901, Foggia, Italy – January 15, 1991), simply known as Slydini, was a world-renowned magician.
 His mastery, expertise, originality and innovative approach to close-up artistry, magic earned him a legendary reputation in the magic world.
 He traveled the world performing for the public as well as performing and lecturing fellow magicians.
 As a result, he served as an inspiration to generations of well-known magicians, celebrities and entertainers, including Doug Henning, Dick Cavett, Bill Bixby, Ricky Jay, David Copperfield and countless others.
 Although he was best known as a master of close-up artistry, he continually demonstrated an extraordinary performing ability and during his lifetime was responsible for a long series of books, films and publications highlighting his mastery of the magical crafts.
 For his work, he received the highest honors that his profession could bestow, including both the coveted "Masters Fellowship Award" and "Performing Fellowship Award" from the Academy of Magical Arts.
 During his lifetime, Tony Slydini was inducted into the Society of American Magicians Hall of Fame as a "Living Legend".