Question: The Killers, starring Ashton Kutcher, uses the song "Beauty in the World" by which soul singer?

Context paragraphs:
My Boss's Daughter: My Boss's Daughter is a 2003 romantic comedy film starring Ashton Kutcher, Tara Reid and Terence Stamp.

The Ranch (TV series): The Ranch is an American comedy web television series starring Ashton Kutcher, Danny Masterson, Debra Winger and Sam Elliott that debuted in 2016 on Netflix.  The show takes place on the fictional Iron River Ranch, Colorado; detailing the life of the Bennetts, a dysfunctional family consisting of two brothers, their rancher father, and his separated wife and local bar owner.  While the opening sequence shows scenes from Ouray, Colorado and surrounding Ouray County, "The Ranch" is filmed on a sound stage in front of a live audience in Burbank, California.  Each season consists of 20 episodes broken up into two parts, each containing 10 episodes.

Ashton Kutcher: Christopher Ashton Kutcher ( ; born February 7, 1978) is an American actor and investor.  Kutcher began his career as a model and began his acting career portraying Michael Kelso in the Fox sitcom "That '70s Show," which aired for eight seasons.  He made his film debut in the romantic comedy "Coming Soon" and became known by audiences in the comedy film "Dude, Where's My Car? ", which was a box office hit.  In 2003, Kutcher appeared in romantic comedies "Just Married" and "My Boss's Daughter" and, the same year, he created, produced, and hosted "Punk'd" which aired on MTV for five seasons until its revival in 2012.  In 2004, Kutcher starred in the lead role of the psychological film "The Butterfly Effect" and gained public recognition.

The Brymers: The Brymers were an American garage rock band from San Joaquin Valley, California, who were active in the 1960s.  They had a regional hit with the song "Sacrifice", which also received distribution overseas and managed to garnish airplay in parts of Europe, New Zealand, and Australia.  Although they only released one single, they recorded numerous unissued tracks that would subsequently be released on CD between 2007 and 2008.  The group reunited in 2007 and have since been active on stage and in the studio, releasing five CDs containing old and new material.  "Sacrifice" and their version of "The House of the Rising Sun" were both featured in the film "Jobs" starring Ashton Kutcher.  Their song "I Want to Tell You" was included in a scene from the ABC TV series "Once Upon A Time".

Spread (film): Spread is a 2009 sex comedy film starring Ashton Kutcher and Anne Heche and directed by David Mackenzie.  The film was released under the name "L.A. Gigolo" in Denmark, Finland, Norway, and Sweden, as "Toy Boy" in France, Germany, Italy and The Netherlands, "Oh yeah" in Argentina, as "American Playboy" in Spain and Portugal, "Jogando com Prazer" in Brazil, "Love, Sex and Celebrity" in Japan, and "S-Lover" in South Korea.  The film was released on January 17 at the Sundance Film Festival and was released on August 14, 2009, in North American theatres.

A Lot like Love: A Lot Like Love is a 2005 romantic comedy-drama film directed by Nigel Cole and starring Ashton Kutcher and Amanda Peet.  The screenplay by Colin Patrick Lynch focuses on two individuals whose relationship slowly evolves from lust to friendship to romance over the course of seven years.

The Butterfly Effect: The Butterfly Effect is a 2004 American psychological thriller supernatural fiction film written and directed by Eric Bress and J. Mackye Gruber, starring Ashton Kutcher and Amy Smart.  The title refers to the butterfly effect, a popular hypothetical example of chaos theory which illustrates how small initial differences may lead to large unforeseen consequences over time.

Beauty in the World: "Beauty in the World" is a song by the American soul singer Macy Gray.  It is the first single from her fifth album, "The Sellout".  The song was released digitally on March 30, 2010 in the United States and the music video, as well.  It was notably used on the series finale of the ABC comedy dramedy series "Ugly Betty" episode "Hello Goodbye", in the films "Killers" and "A Little Bit of Heaven", and in Microsoft videos for Internet Explorer 9.

Just Married: Just Married is a 2003 American romantic comedy film directed by Shawn Levy, and was written by Sam Harper, and starring Ashton Kutcher and Brittany Murphy.  Produced by Robert Simonds, the film was successful at the box office despite generally negative critical reviews.

Killers (2010 film): Killers is a 2010 American action comedy film directed by Robert Luketic and starring Katherine Heigl and Ashton Kutcher.  The film was released on June 4, 2010.  The film centers on a young woman (Heigl) who meets the man of her dreams (Kutcher) who turns out to be an assassin.

Supporting paragraphs: Beauty in the World Killers (2010 film)
Answer: Macy Gray