Louis Daniel Armstrong (August 4, 1901 – July 6, 1971), nicknamed "Satchmo", "Satch", and "Pops", was an American trumpeter and vocalist. He was among the most influential figures in jazz. His career spanned five decades and several eras in the history of jazz. Armstrong received numerous accolades including the Grammy Award for Best Male Vocal Performance for Hello, Dolly! in 1965, as well as a posthumous win for the Grammy Lifetime Achievement Award in 1972, and induction into the National Rhythm & Blues Hall of Fame in 2017.

Armstrong was born and raised in New Orleans. Coming to prominence in the 1920s as an inventive trumpet and cornet player, he was a foundational influence in jazz, shifting the focus of the music from collective improvisation to solo performance. Around 1922, Armstrong followed his mentor, Joe "King" Oliver, to Chicago to play in the Creole Jazz Band. Armstrong earned a reputation at "cutting contests", and his fame reached band leader Fletcher Henderson. Armstrong moved to New York City, where he became a featured and musically influential band soloist and recording artist. By the 1950s, Armstrong was a national musical icon, appearing regularly in radio and television broadcasts and on film.

Armstrong's best known songs include "What a Wonderful World", "La Vie en Rose", "Hello, Dolly!", "On the Sunny Side of the Street", "Dream a Little Dream of Me", "When You're Smiling" and "When the Saints Go Marching In". He collaborated with Ella Fitzgerald, producing three records together: Ella and Louis (1956), Ella and Louis Again (1957), and Porgy and Bess (1959). He also appeared in films such as A Rhapsody in Black and Blue (1932), Cabin in the Sky (1943), High Society (1956), Paris Blues (1961), A Man Called Adam (1966), and Hello, Dolly! (1969).