The 80-year-old market trader who became a Chilean music star

<p>Born and raised in Valparaíso, Luis Gómez, better known as JM, is seen as one of the last of a golden generation after a late foray</p><p>At a concert hall in the Chilean capital, Santiago, an 80-year-old man edges unsteadily down a steep staircase. With one hand he grips the me