Longo was born in Amantea. After studying at the Naples Conservatory under Beniamino Cesi (and composition under Paolo Serrao), he began teaching piano at his alma mater in 1887, deputizing for Cesi as pianoforte professor, and succeeded him in 1897. As a pianist, Longo often played in chamber ensemble with the Ferni Quartet, and with the Quartetto Napoletano (with Cantani, Parmiciano, Scarano and Viterbini). He founded various musical institutions in Naples, and gained a high reputation as a concert pianist. In 1914 he began editing the review L'Arte Pianistica. He became Director of the Naples Conservatory in 1944, and died in Naples the following year, aged 80.
Today, Longo is mainly remembered for compiling an almost comprehensive catalogue of the keyboard works of Domenico Scarlatti. For many years, Scarlatti's keyboard sonatas were conventionally identified by their Longo numbers, but these were later superseded by those found in Ralph Kirkpatrick's catalogue. Longo's Catalogue originated in his landmark full publication of the works of Scarlatti in 11 volumes and implied particular groupings of the sonatas, the chronology of which was later completely revised and differently grouped in Kirkpatrick's 1953 study of the composer. Longo also edited works by Domenico Gallo.
- This paragraph derived from Arthur Eaglefield Hull, A Dictionary of Modern Music and Musicians (Dent, London 1924), 87, 303-304.
- A. Longo, 545 Scarlatti Sonatas in XI Volumes (Ricordi, 1906-1913).
- R. Kirkpatrick, Domenico Scarlatti (Princeton University Press, 1953).
- "Permanent Link to Catalog Card Entry for Gallo Sonata, attributed to Pergolesi, as Arranged by Longo". Cornell University. Retrieved 2007-12-11.
- McGraw, Cameron (1981). Piano Duet Repertoire: Music Originally Written for One Piano, Four Hands. Bloomington: Indiana University Press. p. 174. ISBN 0-253-21461-0.
- "Announcement of Recording of Longo's Bassoon Suite op. 69". ATMA. Retrieved 2007-12-11.
- "Announcement of Agora Recording of Flute, Oboe and Clarinet Suites". Records International. April 2000. Archived from the original on 14 December 2007. Retrieved 2007-12-11.
- "Persistent Link to Library Catalog Card for Edizioni Curci 1986 Edition of Clarinet Suite (op. 62)". New York Public Library: Research Libraries. Retrieved 2007-12-11.
- "LOC Authorities". Retrieved October 17, 2011.
- "Notes to Naxos Recording of Achille Longo Piano Quintet". Retrieved October 17, 2011.
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