Question: Who is the American actor who sang Walk Hand in Hand and started in Sally, Irene and Mary?

Context paragraphs:
Sally, Irene and Mary (1938 film): Sally, Irene and Mary is a 1938 American comedy film directed by William A. Seiter and written by Harry Tugend and Jack Yellen.  The film stars Alice Faye, Tony Martin, Fred Allen, Joan Davis, Marjorie Weaver and Gregory Ratoff.  The film was released on March 4, 1938, by 20th Century Fox.

Jan Leighton: Jan Leighton (December 27, 1921 - November 16, 2009) was an American actor and model who appeared in more than 3,000 roles.  He specialized in portraying historic characters, but also worked as a voice actor and hand model.  He was credited by the Guinness Book of World Records with having played more roles than any other actor.

Sally, Irene and Mary: Sally, Irene, and Mary is a 1925 American silent comedy-drama film starring Constance Bennett, Sally O'Neil, and Joan Crawford.  It is based on the 1922 play of the same name by Eddie Dowling and Cyrus Woods.  The play was adapted again in 1938, again titled "Sally, Irene and Mary" and directed by William A. Seiter.  This version stars Alice Faye, Joan Davis and Marjorie Weaver in the title roles, and co-starred Tony Martin, Fred Allen and Jimmy Durante.

George Kennedy: George Harris Kennedy Jr. (February 18, 1925 – February 28, 2016) was an American actor who appeared in more than 200 film and television productions.  He is best remembered for portraying "Dragline" opposite Paul Newman in "Cool Hand Luke" (1967), for which he won the Academy Award for Best Supporting Actor and was nominated for the corresponding Golden Globe.  He received a second Golden Globe nomination for portraying Joe Patroni in "Airport" (1970).

Moses Gunn: Moses Gunn (October 2, 1929 – December 16, 1993) was an American actor of stage and screen.  An Obie Award-winning stage player, he co-founded the Negro Ensemble Company in the 1960s.  His 1962 Off-Broadway debut was in Jean Genet's "The Blacks," and his Broadway debut was in "A Hand is on the Gate," an evening of African-American poetry.  He was nominated for a 1976 Tony Award as Best Actor (Play) for "The Poison Tree" and played Othello on Broadway in 1970.

Eugene Robert Glazer: Eugene Robert Glazer (born December 16, 1942 in Brooklyn, New York) is an American actor best known for his portrayal of "Operations" on the TV show "La Femme Nikita".  Glazer was raised in Brooklyn, New York, and worked at a variety of jobs before moving to Los Angeles in the 1970s to pursue his acting career.  He worked in live theater and starred in a number of television and movie roles before being cast on "La Femme Nikita".  Currently, he resides in California with his wife, actress Xenia Gratsos, who joined him on "La Femme Nikita" as Renee in the 3rd season episode "Hand to Hand", and their two dogs and seven cats - all rescues.

Tony Martin (American singer): Tony Martin (born Alvin Morris; December 25, 1913 – July 27, 2012) was an American actor, best known for his film roles and popular singer.  His career spanned over seven decades, and he scored dozens of hits between the late-1930s and mid-1950s with songs such as "Walk Hand in Hand" and "Stranger in Paradise".  He was married to actress and dancer Cyd Charisse for 60 years until her death in 2008.

Kossoy Sisters: The Kossoy Sisters are identical twin sisters (Irene Saletan and Ellen Christenson ) who performed American folk and old time music.  In their music, Irene sang mezzo-soprano vocal, and Ellen supplied soprano harmony, with Irene on guitar and Ellen played the 5-string banjo in a traditional up-picking technique.  Their performances were notable examples of close harmonies singing.  They began performing professionally in their mid teens and are esteemed as a significant part of the popular folk music movement that started in the mid-1950s.

Jennifer West: Jennifer West is an American artist who lives and works in Los Angeles.  She is known for her digitized films that are made by hand manipulating film celluloid.  She has produced over 70 films since she started working this way in 2004.  Wendy Vogel writes for Artforum.com, "Like her experimental predecessors, West forgoes narrative cohesion in favor of creating jumpy cuts and abstract visual collages––splicing, rolling, and drenching the celluloid using materials from Mylar tape to pickle juice, whiskey to candle smoke."  Christopher Bedford wrote in "Artforum" on her work, "sexy, whimsical, painting-scale DVD projections walk that elusive line between pictorial modes with deftness, wit, and airy originality."  Joanna Kleinberg wrote on her work in Frieze "the intermingling of materiality, feeling and identity creates a wild blend of synaesthetic experience wherein the substances of life literally and figuratively colour the film."

Danny Murphy (actor): Danny Murphy (August 20, 1955 – August 8, 2014) was an American actor.  He was known for his roles in "There's Something About Mary" and in "Me, Myself & Irene".  His last movie role was in "Hall Pass".  Murphy was born in Boston, Massachusetts.

Supporting paragraphs: Sally, Irene and Mary (1938 film) Tony Martin (American singer)
Answer: Tony Martin