While performing as a backup singer and dancer for the French disco artist Patrick Hernandez on his 1979 world tour, Madonna became romantically involved with musician Dan Gilroy. Together, they formed her first rock band, the Breakfast Club, for which Madonna sang and played drums and guitar. In 1980 or 1981 she left Breakfast Club and, with her former boyfriend Stephen Bray as drummer, formed the band Emmy. The two began writing songs together, and Madonna later decided to market herself as a solo act. Their music impressed DJ and record producer Mark Kamins who arranged a meeting between Madonna and Sire Records founder Seymour Stein.

Which year was Patrick Hernandez's world tour held?