'Apparently, he had a fist fight with King Charles': the jawdropping life of Luca Prodan, Argentina's punk god

In 1980, a tall, thin man landed in Buenos Aires airport, at the height of Argentina's military dictatorship. His name was Luca Prodan, a Scottish-Italian rocker, and he had just finished the last of his methadone on the flight over. His arrival would soon send shockwaves through Argentina when he started a band called Sumo, acquainted the country with post-punk, and became a national legend who lives on, his music still earning hundreds of millions of streams. "When I saw Sumo in 1982," says Prodan's younger brother Andrea, "I thought, 'This is more than just a band. This is like…