Louis Daniel Armstrong ( usually pronounced `` Louee '' ) ( August 4 , 1901 â `` July 6 , 1971 ) ( also known by the nicknames Satchmo and Pops ) was an American jazz musician . Louis Daniel Armstrong ( August 4 , 1901 â `` July 6 , 1971 ) , nicknamed Satchmo or Pops , was an American jazz trumpeter and singer from New Orleans , Louisiana .