Louis Daniel Armstrong, nicknamed Satchmo or Pops, was an American jazz trumpeter and singer from New Orleans, Louisiana.

Coming to prominence in the 1920s as an innovative cornet and trumpet player, Armstrong was a foundational influence on jazz, shifting the music's focus from collective improvisation to solo performers. With his distinctive gravelly voice, Armstrong was also an influential singer, demonstrating great dexterity as an improviser, bending the lyrics and melody of a song for expressive purposes. He was also greatly skilled at scat singing, or vocalizing, using syllables instead of actual lyrics.

Renowned for his charismatic stage presence and deep, instantly recognizable voice almost as much as for his trumpet-playing, Armstrong's influence extended well beyond jazz, and by the end of his career in the '60s, he was widely regarded as a profound influence on popular music in general: critic Steve Leggett describes Armstrong as "perhaps the most important American musician of the 20th century." Flea once proclaimed that "Louis Armstrong was probably the greatest musician that ever lived...one note implies that if he wanted to he could play ten billion notes, but just one simple note is a beautiful thing."

In his early years, Armstrong was best known for his virtuosity with the cornet and trumpet. The greatest trumpet playing of his early years can be heard on his Hot Five and Hot Seven records. The improvisations which he made on these records of New Orleans jazz standards and popular songs of the day continue to stack up brilliantly alongside those of any other later jazz performer. The older generation of New Orleans jazz musicians often referred to their improvisations as "variating the melody"; Armstrong's improvisations were daring and sophisticated for the time while often subtle and melodic.

He often essentially re-composed pop-tunes he played, making them more interesting. Armstrong's playing is filled with joyous, inspired original melodies, creative leaps, and subtle relaxed or driving rhythms. The genius of these creative passages is matched by Armstrong's playing technique, honed by constant practice, which extended the range, tone and capabilities of the trumpet. In these records, Armstrong almost single-handedly created the role of the jazz soloist, taking what was essentially a collective folk music and turning it into an art form with tremendous possibilities for individual expression.

Armstrong's work in the 1920s shows him playing at the outer limits of his abilities. The Hot Five records, especially, often have minor flubs and missed notes, which do little to detract from listening enjoyment since the energy of the spontaneous performance comes through. By the mid 1930s, Armstrong achieved a smooth assurance, knowing exactly what he could do and carrying out his ideas to perfection.

Armstrong had many hit records including "Stardust", "What a Wonderful World", "When The Saints Go Marching In", "Dream a Little Dream of Me", "Ain't Misbehavin'", and "Stompin' at the Savoy". "We Have All the Time in the World" featured on the soundtrack of the James Bond film On Her Majesty's Secret Service, and enjoyed renewed popularity in the UK in 1994 when it featured on a Guinness advert. It reached number 3 in the charts on being re-released.

In 1964, Armstrong knocked the Beatles off the top of the Billboard Top 100 chart with "Hello, Dolly!", which gave the 63-year-old performer a U.S. record as the oldest artist to have a #1 song.

His 1964 song, "Bout Time" later featured in the film "Bewitched" (2005).

Armstrong performed in Italy at the 1968 Sanremo Music Festival where he sang "Mi Va di Cantare" alongside his friend, the Eritrean-born Italian singer Lara Saint Paul. In February 1968, he also appeared with Lara Saint Paul on the Italian Rai television channel where he performed "Grassa e Bella", a track he sang in Italian for the Italian market and C.D.I. label.

In 1968, Armstrong scored one last popular hit in the United Kingdom with the highly sentimental pop song "What a Wonderful World", which topped the British charts for a month; however, the single did not chart at all in America. The song gained greater currency in the popular consciousness when it was used in the 1987 movie Good Morning, Vietnam, its subsequent rerelease topping many charts around the world. Armstrong even appeared on the October 28, 1970 Johnny Cash Show, where he sang Nat "King" Cole's hit "Rambling Rose" and joined Cash to re-create his performance backing Jimmie Rodgers on "Blue Yodel #9".

Armstrong died just after a heart attack on July 6, 1971, a month before his 70th birthday 11 months after playing a famous show at the Waldorf-Astoria's Empire Room. Shortly before his death he stated, "I think I had a beautiful life. I didn't wish for anything that I couldn't get and I got pretty near everything I wanted because I worked for it." He was residing in Corona, Queens, New York City, at the time of his death.He was interred in Flushing Cemetery, Flushing, in Queens, New York City.