"Un'estate italiana" (Italian: [uneˈstaːte itaˈljaːna]), "Un verano italiano" (Spanish: [um beˈɾano itaˈljano]; both meaning "An Italian summer") or "To Be Number One" is a 1989 song composed by Giorgio Moroder which was used as the official song of the 1990 FIFA World Cup held in Italy, the first to hold such distinction.

The English version, with lyrics by Tom Whitlock and performed by Giorgio Moroder Project (singers: Joe Milner, Moll Anderson, Paula Mulcahy Keane),[1] was the opening theme to RAI TV programmes and matches related to the 1990 FIFA World Cup.

For the Italian release, Moroder addressed Gianna Nannini and Edoardo Bennato, who rewrote the lyrics and took the song to the top of the charts in Italy and Switzerland.

The song was presented for the first time by the two singer-songwriters in Milan in December 1989, and performed live during the opening ceremony, held on 8 June 1990, in Milan, before the Argentina–Cameroon opening match, followed later also by the English version.

In 1990, Hong Kong singer Alan Tam covered this song in Cantonese under the title "Ideals and Peace" (Chinese: 理想與和平; Jyutping: Lei5soeng2 jyu5 wo4ping4).