found: Work cat: Becker, M. La canzone napoletana, 1999(a history of the popular Neapolitan song, associated with the annual Piedigrotta festival, and songwriters such as Tosti and De Curtis)
found: New Grove dict. of music and musicians:v. 13, p. 31, under Naples, Italy (Neapolitan song ... its golden era, during the late 19th and early 20th centuries; traditional song festival on 7 September)
found: OCLC, July 17, 2000(numerous book and score titles beginning with the words "Neapolitan song" or "Neapolitan songs")
notfound: Encyc. Brit.