With a handkerchief held tightly in his left hand as he grasped his trumpet while steadily pushing the keys down with the right, "When the Saints - Go Marching in..." Every once in a while he would drop the trumpet to his side singing with the raspy tone of Louis Armstrong.
On an interesting side note, Armstrong (nicknamed Pops or Satchmo) also played with a handkerchief in his left hand when playing the trumpet or cornet. Armstrong died at the age of 70 in 1971.
"Musicians don't retire; they stop when there's no more music in them." - Louis Armstrong