""Funiculi, funicula" has nothing to do with Strauss, nor would anyone have claimed it as classical."
Jim Carroll

Wiki - (known to be wrong before, of course)
"German composer Richard Strauss heard the song while on a tour of Italy six years after it was written. He thought that it was a traditional Neapolitan folk song and incorporated it into his Aus Italien tone poem. Denza filed a lawsuit against him and won, and Strauss was forced to pay him a royalty fee.
Russian composer Nikolai Rimsky-Korsakov also mistook "Funiculì, Funiculà" for a traditional folk song and used it in his 1907 "Neapolitanskaya pesenka" (Neapolitan Song).
Cornettist Herman Bellstedt used it as the basis for a theme and variations titled Napoli; a transcription for euphonium is also popular among many performers. Modernist composer Arnold Schoenberg arranged a version for ensemble in 1921."