Born: September 25, 1871, Boston, Massachusetts.
Died: March 8, 1944, Ventnor City, New Jersey.
Buried: Forest Hills Cemetery, Jamaica Plain, Massachusetts.
Percy was the son of William Atherton, a Boston leather merchant, and Mary Edwards Dwight; grandson of Samuel Atherton (1784–1877), a founding member of the Stoughton Musical Society; and a descendant of Major General Humphrey Atherton ( ca.1608–61), a Puritan and early settler of Massachusetts Bay Colony.
He studied at the Boston Latin School and the Phillips Academy, Andover, Massachusetts, graduating in 1889. He graduated from Harvard University in 1893 with honors in music.
He then spent two years at the Königliche bayerische Musikschule in Munich under Josef Rheinberger and Ludwig Thuille.
In 1896, he studied with Otis Bardwell Boise in Berlin, in 1900 with Giovanni Sgambati in Rome, and later with Charles Marie Widor in Paris.
Atherton was acting chief of the music division of the United States Library of Congress, 1929–42.
He composed a number of comic operas, dozens of songs, and a number of violin and piano pieces, and:
If you know where to get a good photo of Atherton (head & shoulders, at least 200×300 pixels),