Singing is the act of producing musical sounds with the voice, and augments regular speech by the use of both tonality and rhythm. One who sings is called a singer or vocalist. Singers perform music known as songs that can be sung either with or without accompaniment by musical instruments. Singing is often done in a group of other musicians, such as in a choir of singers with different voice ranges, or in an ensemble with instrumentalists, such as a rock group or baroque ensemble. As in many respects human song is a form of sustained speech, nearly anyone able to speak can also sing. Singing can be formal or informal, arranged or improvised. It may be done for pleasure, comfort, ritual, education, or profit. Excellence in singing requires time, dedication, instruction, and regular practice. Professional singers usually build their careers around one specific musical genre, such as classical or rock. They typically take voice training provided by voice teachers or vocal coaches throughout their careers.

Whitney Elizabeth Houston (August 9, 1963 – February 11, 2012) was an American recording artist, actress, producer, and model. In 2009, the Guinness World Records cited her as the most-awarded female act of all-time. Houston was one of the world's best-selling music artists, having sold over 170 million albums, singles and videos worldwide. She released seven studio albums and three movie soundtrack albums, all of which have diamond, multi-platinum, platinum or gold certification. Houston's crossover appeal on the popular music charts, as well as her prominence on MTV, starting with her video for "How Will I Know", influenced several African American female artists to follow in her footsteps.

Houston is the only artist to chart seven consecutive No. 1 Billboard Hot 100 hits. She is the second artist behind Elton John and the only female artist to have two number-one Billboard 200 Album awards (formerly "Top Pop Album") on the Billboard magazine year-end charts. Houston's 1985 debut album Whitney Houston became the best-selling debut album by a female act at the time of its release. The album was named Rolling Stone's best album of 1986, and was ranked at number 254 on Rolling Stone's list of the 500 Greatest Albums of All Time. Her second studio album Whitney (1987) became the first album by a female artist to debut at number one on the Billboard 200 albums chart.

Eric Marlon Bishop (born December 13, 1967), professionally known as Jamie Foxx, is an American actor, singer-songwriter, rapper, stand-up comedian, and talk radio host who began playing the piano when he was five years old. As an actor, his work in the film Ray earned him the Academy Award and BAFTA Award for Best Actor as well as the Golden Globe Award for Best Actor in a musical/comedy. He is also a Grammy Award winning musician, producing three albums which have charted highly on the Billboard 200: Unpredictable, which topped the chart, Best Night of My Life and Intuition.

Born in Terrell, Texas, Foxx was raised by his mother's adoptive parents. He performed in high school and was awarded with a scholarship to United States International University. In his twenties, Foxx began performing stand-up at comedy clubs, and eventually joined the cast of In Living Color in 1991; this exposure helped him land film roles and star in his own sitcom, The Jamie Foxx Show. He released his debut album, Peep This, in 1994, but he did not gain significant musical success until 2004 when he was featured in Twista's song "Slow Jamz". Also in 2004, Foxx played critically acclaimed roles in the films Collateral and Ray. He released his second album, Unpredictable, in 2005, which was helped by his collaboration on Kanye West's number-one single "Gold Digger". His third album Intuition was released in 2008 and was anchored by the single "Blame It". Foxx released his fourth studio album, Best Night of My Life, in 2010.

Onika Tanya Maraj (born December 8, 1982), known by her stage name Nicki Minaj ( /mɪˈnɑːʒ/), is a Trinidadian-born American rapper and singer-songwriter. She was born in Saint James, Trinidad and Tobago and when she was 5 years of age she moved to the New York City borough of Queens, where she grew up.

After releasing three mixtapes between 2007 and 2009 and being signed to Young Money Entertainment in August 2009, Minaj released her debut album, Pink Friday, in November 2010. It quickly became a commercial success, peaking at number one on the U.S. Billboard 200 and being certified Platinum by the Recording Industry Association of America (RIAA) a month after its release. She became the first female solo artist to have seven singles on the Billboard Hot 100 at the same time. Her second single, "Your Love", reached number 1 on the Billboard Hot Rap Songs chart, making Minaj the first female artist to top the chart unaccompanied since 2002. She also became the first female artist to be included on MTV's Annual Hottest MC List. Minaj was named the 2011 Rising Star by Billboard. Her second studio album, Pink Friday: Roman Reloaded was released on April 3, 2012.

Chris Austin Hadfield, O.Ont, MSC, CD (born 29 August 1959) is a Canadian astronaut from the Canadian Space Agency (CSA) who was the first Canadian to walk in space. Hadfield has flown two space shuttle missions, STS-74 in 1995 and STS-100 in 2001. He has served as CAPCOM for both Space Shuttle and International Space Station (ISS) expeditions. He is currently training for a long duration stay on board the ISS, which will include command of Expedition 35 in 2012–13. He will be the first Canadian to command the ISS. He is enthusiastic about the prospects for a manned mission to Mars, and when asked if he would consider a one-way journey to Mars to be the first to visit, he said "I would be honoured to be given the opportunity."

Chris Hadfield was born in Sarnia, Ontario. His parents are Roger and Eleanor Hadfield who currently reside in Milton, Ontario. Hadfield was raised on a corn farm in southern Ontario and became interested in flying at a young age—from his own words in the interview to STRF.RU, he came to the idea of being astronaut when he was nine on the day of Apollo moon landing, which he had seen on TV then. Hadfield is married to his high-school girlfriend Helene Hadfield, and they have three adult children together.