Fever (also known as pyrexia) is a common medical sign characterized by an elevation of temperature above the normal range of 36.5–37.5 °C (98–100 °F) due to an increase in the body temperature regulatory set-point. This increase in set-point triggers increased muscle tone and shivering.

As a person's temperature increases, there is, in general, a feeling of cold despite an increasing body temperature. Once the new temperature is reached, there is a feeling of warmth. A fever can be caused by many different conditions ranging from benign to potentially serious. There are arguments for and against the usefulness of fever, and the issue is controversial. With the exception of very high temperatures, treatment to reduce fever is often not necessary; however, antipyretic medications can be effective at lowering the temperature, which may improve the affected person's comfort.

Fever differs from uncontrolled hyperthermia, in that hyperthermia is an increase in body temperature over the body's thermoregulatory set-point, due to excessive heat production and/or insufficient thermoregulation.

Peggy Lee (May 26, 1920 – January 21, 2002) was an American jazz and popular music singer, songwriter, composer, and actress in a career spanning six decades. From her beginning as a vocalist on local radio to singing with Benny Goodman's big band, she forged a sophisticated persona, evolving into a multi-faceted artist and performer. She wrote music for films, acted, and created conceptual record albums—encompassing poetry, jazz, chamber pop, and art songs.

Lee was born Norma Deloris Egstrom in Jamestown, North Dakota, the seventh of eight children of Marvin Olof Egstrom, a station agent for the Midland Continental Railroad, and his wife Selma Amelia (Anderson) Egstrom. Her mother died when Lee was just four years old. Her father was Swedish American and her mother was Norwegian American.

Lee first sang professionally over KOVC radio in Valley City, North Dakota. She later had her own series on a radio show sponsored by a local restaurant that paid her a "salary" in food. Both during and after her high school years, Lee sang for paltry sums on local radio stations. Radio personality Ken Kennedy, of WDAY in Fargo, North Dakota (the most widely heard station in North Dakota), changed her name from Norma to Peggy Lee.^{[citation needed]} Thereafter, Lee left home and traveled to Los Angeles at the age of 17.

Elvis Aaron Presley (January 8, 1935 – August 16, 1977) was one of the most popular American singers of the 20th century. A cultural icon, he is widely known by the single name Elvis. He is often referred to as the "King of Rock and Roll" or simply "the King".

Born in Tupelo, Mississippi, Presley moved to Memphis, Tennessee, with his family at the age of 13. He began his career there in 1954, working with Sun Records owner Sam Phillips, who wanted to bring the sound of African American music to a wider audience. Accompanied by guitarist Scotty Moore and bassist Bill Black, Presley was the most important popularizer of rockabilly, an uptempo, backbeat-driven fusion of country and rhythm and blues. RCA Victor acquired his contract in a deal arranged by Colonel Tom Parker, who would manage the singer for over two decades. Presley's first RCA single, "Heartbreak Hotel", released in January 1956, was a number one hit. He became the leading figure of the newly popular sound of rock and roll with a series of network television appearances and chart-topping records. His energized interpretations of songs, many from African American sources, and his uninhibited performance style made him enormously popular—and controversial. In November 1956, he made his film debut in Love Me Tender.

George "Buddy" Guy (born July 30, 1936) is an American blues guitarist and singer. Critically acclaimed, he is a pioneer of the Chicago blues sound and has served as an influence to some of the most notable musicians of his generation. "A key influence on Eric Clapton, Jimi Hendrix and Stevie Ray Vaughan, Buddy Guy put the Louisiana hurricane in 1960s electric Chicago blues as a member of Muddy Waters' band and as a house guitarist at Chess Records. A native of the Baton Rouge area, he combined a blazing modernism with a fierce grip on his roots, playing frantic leads heavy with swampy funk on Howlin' Wolf's 'Killing Floor' and Koko Taylor's 'Wang Dang Doodle' as well as on his own Chess sides and the fine series of records he made with harp man Junior Wells. One of the last active connections to the golden age of Chess, Guy still plays with his original fire."

Ranked thirtieth in Rolling Stone magazine's list of the "100 Greatest Guitarists of All Time", Guy is known for his showmanship on stage: playing his guitar with drumsticks or strolling into the audience while playing solos. His song "Stone Crazy" was ranked seventy-eighth in list of the 100 Greatest Guitar Songs of All Time also of Rolling Stone.

William Edward John (November 15, 1937 - May 26, 1968), better known by his stage name Little Willie John, was an American R&B singer who performed in the 1950s and early 1960s. Many sources erroneously give his middle name as Edgar. He is best known for his popular music chart successes with songs such as, "All Around the World" (1955), "Need Your Love So Bad" (1956) and "Fever" the same year, the latter covered in 1958 by Peggy Lee.

He was born in Cullendale, Arkansas, one of ten children, his family moving to Detroit, Michigan when he was four so that his father could pursue factory work. In the late 1940s, the eldest children, including Willie, formed a gospel singing group, and Willie also performed in talent shows, which brought him to the notice of Johnny Otis and, later, musician and producer Henry Glover. After seeing him sing with the Paul "Hucklebuck" Williams orchestra, Glover signed him to a recording contract with King Records in 1955. He was nicknamed "Little Willie" John for his short stature.