Variety Staff Follow Us on TwitterFor more than 20 years, the Latin Alternative Music Conference has been an incubator for new sounds of all genres, and has helped power the careers of countless executives and artists from all over the world, ranging from Natalia Lafourcade and Café Tacuba to Manu Chao and the Nortec Collective.Like most conferences, LAMC has been moved online this year, but its lineup is as strong as ever, with executives like Rosalia manager Rebeca Leon and Sony/ATV Latin