 His first single with RCA is "Non te ne andare" ("Don't go"), released in 1963 and written by Gianni Meccia and Lilli Greek.In 1965, Fontana had his major success with "Il mondo" ("The world"), a song composed by Fontana and Carlo Pes, and arranged by Ennio Morricone, with lyrics by Gianni Meccia, which reached the top of the charts in Italy and other countries in Europe and charted in Latin America as well.The same year, he made his debut as an actor, appearing in two "musicarelli", which are movies heavily featuring musical numbers, titled "Viale della canzone" ("Avenue of song") and "008 Operazione ritmo" ("008 Operation rhythm").