US President Barack Obama has welcomed plans for a massive but controversial concert in Havana on Sunday by Miami-based music star Juanes. Obama told US Spanish language network Univision that the concert, which is expected to draw around half a million Cubans, could help improve ties with Cuba. Obama's Secretary of State Hillary Clinton had met the Colombian singer before he left for Cuba, with both drawing criticism from Miami's Cuban exile community for a performance they say will legitimize the island's communist regime. "My understanding is that he's a terrific musician. He puts on a very good concert," Obama...