It was originally performed by Italian singer Patty Pravo and released as a single from the album of the same name in 1973.

1 in the Italian singles chart and stayed at the top for nine consecutive weeks between August and October 1973.

"Pazza idea" was the second best-selling single of 1973 in Italy and remains one of the biggest hits of Patty Pravo's career.

The music video for the song was filmed in Forte dei Marmi and London.

The singer has recorded the track in Spanish as "Una locura", in English as "Crazy Idea", and in German as "Was für ein Tag".