Music is often about making a tasty mix out of different styles. So mix Jamaican ska music – itself a blend of calypso, jazz and rhythm and blues – with modern Mexican rock music and what do you get?

A papier–mache effigy of Donald Trump flies across the crowded stage floor. Beach balls crisscross, and later a girl nearly faints before being escorted to safety by security. An ecstatic man in a ...