Who whistled "The Good, the Bad and the Ugly" movie theme?

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, and composed more than 40 film scores and countless library music.

"The Good, the Bad and the Ugly" is a 1966 Italian epic spaghetti Western film directed by Sergio Leone and starring Clint Eastwood as "the Good", Lee Van Cleef as "the Bad", and Eli Wallach as "the Ugly".

The film's composer was Ennio Morricone, but the main theme was supplied by his friend Alessandro Alessandroni, who also played guitar on the soundtrack. Alessandroni was the expert whistler in several Sergio Leone spaghetti westerns and he has worked on over 50 movie soundtracks most notably the Sergio Leone trio "A Fistful of Dollars", "The Good, the Bad and the Ugly", "For a Few Dollars More" as well as "The Seven Golden Men".