Arthur Willard Pryor (September 22, 1869 – June 18, 1942) was a trombone virtuoso, bandleader, and soloist with the Sousa Band. He was a prolific composer of band music, his best-known composition being "The Whistler and His Dog". In later life, he became a Democratic Party politician from New Jersey, who served on the Monmouth County Board of Chosen Freeholders during the 1930s.
Pryor was born on the second floor of the Lyceum Theater in Saint Joseph, Missouri. He was the son of Samuel Pryor, bandmaster and founder of the original Pryor band, and his wife. Arthur first took up music at a very young age under the tutelage of his father and was playing the valve trombone by age 11. The story goes that whenever he hit a sour note while practicing, his father planted a resounding crack on his head with a violin bow. The boy developed until he was so skilled that he won a place in the John Philip Sousa's band. He was hailed as a prodigy after this.
Pryor went on to direct the Stanley Opera Company in Denver, Colorado until joining the John Philip Sousa Band in 1892. He played his first solo with the Sousa Band at age 22 during the 1893 World's Columbian Exposition in Chicago. During his 12 years with the Sousa Band, Pryor estimated that he played 10,000 solos. From 1895 to 1903, Pryor was assistant conductor of the Sousa Band. During his association with the "March King", Pryor toured throughout the USA and Europe. While in Europe, he entertained King Edward VII of England and Czar Nicholas II of Russia with his trombone solos. Once while in Germany, all the trombonists of the German Army bands were ordered to hear him play. They were so amazed at his playing that they insisted on taking his trombone apart, refusing to believe that it was natural. Finally one German said: "No one can play so well. It is a Yankee trick."