Louis Daniel Armstrong (August 4, 1901– July 6, 1971), nicknamed Satchmo, Satch or Pops, was an American trumpeter, composer, singer and occasional actor who was one of the most influential figures in jazz. His career spanned five decades, from the 1920s to the 1960s, and different eras in the history of jazz.

Coming to prominence in the 1920s as an "inventive" trumpet and cornet player, Armstrong was a foundational influence in jazz, shifting the focus of the music from collective improvisation to solo performance. With his instantly recognizable 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 very skilled at scat singing.

In 1964, after over two years without setting foot in a studio, he recorded his biggest-selling record, "Hello, Dolly!", a song by Jerry Herman, originally sung by Carol Channing. Armstrong's version remained on the Hot 100 for 22 weeks, longer than any other record produced that year, and went to No. 1 making him, at 62 years, 9 months and 5 days, the oldest person ever to accomplish that feat. In the process, he dislodged the Beatles from the No. 1 position they had occupied for 14 consecutive weeks with three different songs. Armstrong made his last recorded trumpet performances on his 1968 album Disney Songs the Satchmo Way.

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