Viroj Yakham, 47, originally formed his phin (Isaan guitar) band, Khun Narin Phin Prayuk (or Khun Narin's Electric Phin Band), as a way to help young men in his village find jobs. Six years later, it is signed to a US record label and is embarking on its second tour to Europe this month. Here, we talk to Viroj and his son, Sumet Yakham, 25, about the journey.