Reaction may refer to: Response to another event

Justin Drew Bieber ( /ˈbiːbər/ BEE-bər, born March 1, 1994) is a Canadian Pop/R&B singer-songwriter, musician, and actor. Bieber was discovered in 2008 by Scooter Braun, who came across Bieber's videos on YouTube and later became his manager. Braun arranged for him to meet with Usher in Atlanta, Georgia, and Bieber was soon signed to Raymond Braun Media Group (RBMG), a joint venture between Braun and Usher, and then to a recording contract with Island Records offered by L.A. Reid. Bieber's debut single, "One Time", was released in 2009 and peaked in the top twenty in Canada and charted in the top thirty in several international markets. His debut album, the seven-track EP My World, followed in November 2009, and was soon certified platinum in the United States. He became the first artist to have seven songs from a debut album chart on the Billboard Hot 100.

Robin Charles Thicke ( /ˈθɪk/; born March 10, 1977) is an American R&B singer-songwriter, musician, composer, and actor. Thicke's albums, which he previously released under the name Thicke, are noted for their feature of a predominantly R&B sound. Thicke has written hits for popular artists such as Jennifer Hudson, Usher, Mary J. Blige and Raven-Symoné. Thicke has also been acknowledged for his work in popular albums such as Confessions and Tha Carter III.

Thicke is a judge on the ABC show Duets.

Before his days as a singer-songwriter, Thicke had written "Love Is On My Side" on Brandy's self-titled album and a number of songs for 3T's "Sexual Attention" and collaborated with Jordan Knight, Jimmy Jam and Terry Lewis on several songs in Knight's 1999 album Jordan Knight. He also co-wrote the songs "When You Put Your Hands On Me" for Christina Aguilera's debut album and "No Tears on My Pillow" for Mýa's sophomore release, Fear of Flying. As an artist, he recorded and performed solely under his surname, Thicke. He would continue to do so until 2005.

The term black people is used in some socially-based systems of racial classification for humans of a dark-skinned phenotype, relative to other racial groups represented in a particular social context. Different societies apply different criteria regarding who is classified as "black", and often social variables such as class and socio-economic status also play a role, so that relatively dark-skinned people can be classified as white if they fulfill other social criteria of "whiteness" and relatively light-skinned people can be classified as black if they fulfill the social criteria for "blackness" in a particular setting.

As a biological phenotype being "black" is often associated with the very dark skin colors of some people who are classified as "black". But, particularly in the United States, the racial or ethnic classification also refers to people with all possible kinds of skin pigmentation from the darkest through to the very lightest skin colors, including albinos, if they are believed by others to have African ancestry, or to exhibit cultural traits associated with being "African-American". As a result, in the United States the term "black people" is not an indicator of skin color but of socially based racial classification.