Milva (b. Maria Ilva Biolcati). She was also known as 'La Rossa', (Italian for 'The Red'), due to the colour of her hair. Milva was one the most populra female Italian singers of the 60's. This original Italian version of the song has been very hard to find, and since I don't have it, I'll present the - even rarer - English language version. Apparently Milva was trying to reach the vast English -speaking audience and become a truly international star. The song was released in UK on the B-side of a single in 1967, with the title "Seasons Of Love". However, it failed to draw any attention.
Here's the pair: