Question: Heidi's Song is a 1982 American animated musical feature film whose voice cast included an American singer who at the age of three began his career in what?

Context paragraphs:
Sammy Davis Jr.: Samuel George Davis Jr. (December 8, 1925 – May 16, 1990) was an American singer, dancer, actor and comedian.  He was noted for his impressions of actors, musicians and other celebrities.  At the age of three, Davis began his career in vaudeville with his father and Will Mastin as the Will Mastin Trio, which toured nationally.  After military service, Davis returned to the trio.  Davis became an overnight sensation following a nightclub performance at Ciro's (in West Hollywood) after the 1951 Academy Awards.  With the trio, he became a recording artist.  In 1954, he lost his left eye in a car accident, and several years later, he converted to Judaism.

Heidi's Song: Heidi's Song is a 1982 American animated musical feature film produced by Hanna-Barbera.  The film is based on the novel "Heidi" by Johanna Spyri.  Among the voice cast are Lorne Greene as Grandfather, Margery Gray as Heidi and Sammy Davis Jr. as Head Ratte.  It is one of only four movies Hanna-Barbera ever made that did not feature their trademark characters (along with "Charlotte's Web", "C.H.O.M.P.S.", and "Once Upon a Forest").

The Hunchback of Notre Dame (1996 film): The Hunchback of Notre Dame is a 1996 American animated musical drama film produced by Walt Disney Feature Animation for Walt Disney Pictures.  The 34th Disney animated feature film, the film is based on Victor Hugo's novel of the same name.  The plot centers on Quasimodo, the deformed bell-ringer of Notre Dame, and his struggle to gain acceptance into society.  Directed by Kirk Wise and Gary Trousdale and produced by Don Hahn, the film's voice cast features Tom Hulce, Demi Moore, Tony Jay, Kevin Kline, Paul Kandel, Jason Alexander, Charles Kimbrough, David Ogden Stiers, and Mary Wickes in her final film role.

Pocahontas (1995 film): Pocahontas is a 1995 American animated musical romantic-comedy-drama film produced by Walt Disney Feature Animation for Walt Disney Pictures.  The 33rd Disney animated feature film, the film is part of the era known as the Disney Renaissance which lasted from 1989 to 1999.  Directed by Mike Gabriel and Eric Goldberg, the film is inspired by the known history and folklore surrounding the Native American woman Pocahontas and portrays a fictionalized account of her historical encounter with Englishman John Smith and the Jamestown settlers that arrived from the Virginia Company.  The voice cast features Irene Bedard, Mel Gibson, David Ogden Stiers, Russell Means, Christian Bale, Billy Connolly, and Linda Hunt.  The musical score was written by Alan Menken, with songs written by Menken and lyricist Stephen Schwartz.

Mohanlal filmography: []Mohanlal] is an Indian actor, producer, and singer who has starred in both blockbuster and art house films for independent filmmakers.  During his career, he has appeared in more than 340 feature films, primarily in Malayalam cinema but also in other languages including Hindi, Tamil, Telugu, and Kannada.  In 1978, when he was 18, he started acting with a minor comedic role in the unreleased film "Thiranottam", before making screen debut in 1980 as antagonist in the romance film "Manjil Virinja Pookkal".  His portrayal of Narendran, a sadistic husband, received recognition and the film developed a cult status in Malayalam cinema.  Subsequently, Mohanlal was cast as the antagonist in many films.  His first positive role was in "Padayottam" (1982), the first 70 mm film in Malayalam.  In 1984 he starred in "Poochakkoru Mookkuthi", a comedy film whose success triggered a trend and popularised the genre in the 1980s.  In an early critically acclaimed performance, Mohanlal played an antihero in the I. V. Sasi-directed thriller "Uyarangalil" (1984).  In the same year, he co-founded Casino Films, a motion picture production company which later produced his popular comedies "Gandhinagar 2nd Street" (1986) and "Nadodikkattu" (1987).

The Lion King: The Lion King is a 1994 American animated epic musical film produced by Walt Disney Feature Animation and released by Walt Disney Pictures.  It is the 32nd Disney animated feature film, and the fifth animated film produced during a period known as the Disney Renaissance.  "The Lion King" was directed by Roger Allers and Rob Minkoff, produced by Don Hahn, and has a screenplay credited to Irene Mecchi, Jonathan Roberts, and Linda Woolverton.  Its original songs were written by composer Elton John and lyricist Tim Rice, and original scores were written by Hans Zimmer.  The film features an ensemble voice cast that includes Matthew Broderick, James Earl Jones, Jeremy Irons, Jonathan Taylor Thomas, Moira Kelly, Nathan Lane, Ernie Sabella, Rowan Atkinson, Robert Guillaume, Madge Sinclair, Whoopi Goldberg, Cheech Marin, and Jim Cummings.  The story takes place in a kingdom of lions in Africa and was influenced by William Shakespeare's "Hamlet".

The Princess and the Frog: The Princess and the Frog is a 2009 American animated musical film produced by Walt Disney Animation Studios and released by Walt Disney Pictures.  The 49th Disney animated feature film, the film is loosely based on the novel "The Frog Princess" by E. D. Baker, which is in turn based on the Brothers Grimm fairy tale "The Frog Prince".  Written and directed by Ron Clements and John Musker, the film features an ensemble voice cast that stars Anika Noni Rose, Bruno Campos, Keith David, Michael-Leon Wooley, Jennifer Cody, and Jim Cummings, with Peter Bartlett, Jenifer Lewis, Oprah Winfrey, Terrence Howard, and John Goodman.  Set in 1920s New Orleans, the film tells the story of a hardworking waitress named Tiana who dreams of owning her own restaurant.  After kissing a prince who has been turned into a frog by an evil voodoo sorcerer, Tiana becomes a frog herself and must find a way to turn back into a human before it is too late.

Aladdin (1992 Disney film): Aladdin is a 1992 American animated comedy musical romantic fantasy adventure film produced by Walt Disney Feature Animation for Walt Disney Pictures.  The film is the 31st Disney animated feature film, and was the fourth produced during the Disney film era known as the Disney Renaissance.  It was directed by John Musker and Ron Clements, and is based on the Arab-style folktale of the same name from "One Thousand and One Nights" and the French interpretation by Antoine Galland.  The voice cast features Scott Weinger, Robin Williams, Linda Larkin, Jonathan Freeman, Frank Welker, Gilbert Gottfried and Douglas Seale.  The film follows Aladdin, a street urchin, who finds a magic lamp containing a genie.  In order to hide the lamp from the Grand vizier, he disguises himself as a wealthy prince, and tries to impress the Sultan and his daughter.

The Frog Princess (novel): The Frog Princess is a children's novel by E. D. Baker, first published in 2002.  The 2009 Disney animated musical feature film, "The Princess and the Frog", is loosely based on this novel.

Mary and Max: Mary and Max is a 2009 Australian stop motion animated comedy-drama film written and directed by Adam Elliot as his first animated feature film with music by Dale Cornelius and produced by Melanie Coombs and Melodrama Pictures.  The voice cast included Philip Seymour Hoffman, Toni Collette, Eric Bana, Bethany Whitmore with narration by Barry Humphries.  The film premiered on the opening night of the 2009 Sundance Film Festival on January 15, 2009.  The film won the Annecy Cristal in June 2009 from the Annecy International Animated Film Festival, and Best Animated Feature Film at the Asia Pacific Screen Awards in November 2009.  The film was theatrically released on April 9, 2009 by Icon Entertainment International.  "Mary and Max" received very positive reviews from critics and it earned $1.7 million USD on a $8.2 million AUD budget.

Supporting paragraphs: Heidi's Song Sammy Davis Jr.
Answer: vaudeville