Question: Who also provided lyrics along with Howard Ashman on his first Disney duo movie with Alan Menken?

Context paragraphs:
The Little Mermaid (musical): The Little Mermaid is a stage musical produced by Disney Theatrical, based on the animated 1989 Disney film of the same name and the classic story of the same name by Hans Christian Andersen about a mermaid who dreams of the world above the sea and gives up her voice to find love.  Its book is by Doug Wright, music by Alan Menken and lyrics by Howard Ashman (written for the film), with additional lyrics by Glenn Slater.  Its underwater setting and story about aquatic characters requires unusual technical designs and strategies to create gliding movements for the actors.

Human Again (song): "Human Again" is a song originally written for, deleted from, and later restored to the 1991 Disney animated musical "Beauty and the Beast".  With music by Alan Menken and lyrics by Howard Ashman, "Human Again" was replaced during production of the original 1991 version of the film by "Something There", but retained and revised by Menken and new lyricist Tim Rice for the 1994 stage musical adaptation of "Beauty and the Beast".  A newly produced sequence featuring "Human Again" was added to the "Beauty and the Beast" animated film for its 2002 IMAX Special Edition and subsequent DVD, VHS, and Blu-Ray home releases.

Little Shop of Horrors (film): Little Shop of Horrors is a 1986 American rock musical horror comedy film directed by Frank Oz.  It is a film adaptation of the off-Broadway musical comedy of the same name by composer Alan Menken and writer Howard Ashman about a nerdy florist shop worker who finds out his venus fly trap can speak.  Menken and Ashman's Off-Broadway musical was based on the low-budget 1960 film "The Little Shop of Horrors", directed by Roger Corman.  The 1986 film stars Rick Moranis, Ellen Greene, Vincent Gardenia, Steve Martin, and Levi Stubbs as the voice of Audrey II.  The film also featured special appearances by James Belushi, John Candy, Christopher Guest, and Bill Murray.  It was produced by David Geffen through The Geffen Company and released by Warner Bros. on December 19, 1986.

Disney's Aladdin: A Musical Spectacular: Disney's Aladdin: A Musical Spectacular was a Broadway-style show based on Disney's 1992 animated film "Aladdin" with music by Alan Menken and lyrics by Howard Ashman, Tim Rice and Alan Menken.

Howard Ashman: Howard Elliott Ashman (May 17, 1950 – March 14, 1991) was an American playwright and lyricist.  He collaborated with Alan Menken on several works and is most widely known for several animated feature films for Disney, for which Ashman wrote the lyrics and Menken composed the music.  Ashman and Menken began their collaboration with the musical "God Bless You, Mr. Rosewater" (1979), for which Ashman directed and wrote both book and lyrics.  Their next musical, "Little Shop of Horrors" (1982) for which Ashman again directed and wrote both book and lyrics, became a long-running success and led to a 1986 feature film.  The partnership's first Disney film was "The Little Mermaid" (1989), followed by "Beauty and the Beast" (1991).  After his death, some of Ashman's songs were included in another Disney film, "Aladdin" (1992).

The Little Mermaid Jr (musical): The Little Mermaid is a stage musical produced by Disney Theatrical, based on the animated 1989 Disney film of the same name and the classic story of the same name by Hans Christian Andersen about a mermaid who dreams of the world above the sea and gives up her voice to find love.  Its book is by Doug Wright, music by Alan Menken and lyrics by Howard Ashman (written for the film), with additional lyrics by Glenn Slater.  Its underwater setting and story about aquatic characters requires unusual technical designs and strategies to create gliding movements for the actors.  The Little Mermaid Jr first became available to license by the company Music Theater International and Disney Theatrical Productions

Aladdin (2011 musical): Aladdin is a musical based on the 1992 Disney animated film of the same name with music by Alan Menken and lyrics by Howard Ashman, Tim Rice and Chad Beguelin.  Beguelin also wrote the book.  The musical includes three songs written for the film by Ashman but not used there and four new songs written by Menken and Beguelin.

Beauty and the Beast (1991 soundtrack): Beauty and the Beast: Original Motion Picture Soundtrack is the official soundtrack album to the 1991 Disney animated feature film, "Beauty and the Beast".  Originally released on October 29, 1991, by Walt Disney Records, the album's first half – tracks 2 to 9 – generally contains the film's musical numbers, all of which were written by composer Alan Menken and lyricist Howard Ashman, while its latter half – tracks 10 to 14 – features its musical score, composed solely by Menken.  While the majority of the album's content remains within the musical theatre genre, its songs have also been influenced by French, classical, pop and Broadway music.  Credited to Various Artists, "Beauty and the Beast: Original Motion Picture Soundtrack" features performances by the film's main cast – Paige O'Hara, Richard White, Jesse Corti, Jerry Orbach, Angela Lansbury and Robby Benson – in order of appearance.  Additionally, the album features recording artists Celine Dion and Peabo Bryson, who perform a pop rendition of the film's title and theme song, "Beauty and the Beast", which simultaneously serves as the soundtrack's only single.

Beauty and the Beast (Disney song): "Beauty and the Beast" is a song written by lyricist Howard Ashman and composer Alan Menken for the Disney animated feature film "Beauty and the Beast" (1991).  The film's theme song, the Broadway-inspired ballad was first recorded by British-American actress Angela Lansbury in her role as the voice of the character Mrs. Potts, and essentially describes the relationship between its two main characters Belle and the Beast, specifically how the couple has learned to accept their differences and in turn change each other for the better.  Additionally, the song's lyrics imply that the feeling of love is as timeless and ageless as a "tale as old as time".  Lansbury's rendition is heard during the famous ballroom sequence between Belle and the Beast, while a shorted chorale version plays in the closing scenes of the film, and the song's motif features frequently in other pieces of Menken's film score.  "Beauty and the Beast" was subsequently recorded as a pop duet by Canadian singer Celine Dion and American singer Peabo Bryson, and released as the only single from the film's soundtrack on November 25, 1991.

The Little Mermaid (soundtrack): The Little Mermaid: Original Walt Disney Records Soundtrack is the soundtrack to the 1989 Disney animated feature film, "The Little Mermaid".  It contains the songs from the film written by Alan Menken and Howard Ashman, as well as the film's score composed by Alan Menken.  The score was orchestrated by Thomas Pasatieri.  The album has achieved multi-platinum sales and won the Grammy Award for Best Recording for Children.  The album includes recordings of the music that won the Grammy for Best Instrumental Composition Written for a Motion Picture or for Television ("Under the Sea"), the Academy Awards for Best Original Score and Best Original Song ("Under the Sea") and the Golden Globe Award for Best Original Score.

Supporting paragraphs: The Little Mermaid (musical) Howard Ashman
Answer: Glenn Slater