"Fever" is a popular song originally recorded by Little Willie John in 1956. The song expresses the intense emotions and physical sensations associated with love, using the metaphor of fever to describe the overwhelming feelings one experiences when infatuated. Its catchy melody and rhythmic style have made it a classic in the genre of rhythm and blues. The song gained further fame when Peggy Lee released her version in 1958, which became a major hit. Lee's rendition added a sultry and sophisticated touch, solidifying "Fever" as a timeless standard covered by many artists, including Elvis Presley and Michael Bublé.