Fischio In Armonia by Alessandro Alessandroni, released on SR Records in 1970.
Alessandro Alessandroni (18 March 1925 – 26 March 2017) was an Italian musician and composer. He played multiple instruments, including the guitar, mandolin, mandolincello, sitar, accordion and piano, composed more than 40 film scores and countless library music tracks, and was renowned for his whistling technique.
Alessandroni collaborated with his childhood friend Ennio Morricone on a number of soundtracks for Spaghetti Westerns...Alessandroni's twangy guitar riff is central to the main theme for The Good, the Bad and the Ugly. Alessandroni can be heard as the whistler on the soundtracks for Sergio Leone's films... - Wikipedia
Fischio in armonia transalates to “Whistle In Harmony” in English.
https://www.youtube.com/watch?v=IwFIp-1oEuM
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