For this performance, the atmosphere is warm, the mood is contagious, and the salsa steps follow one another. It’s hard not to smile as you get caught up in the intoxication of the brass instruments, and it’s hard not to feel sunshine on the face, and rum in the throat once you get hooked on the feverish congas. Led by salsa giant Oscar Hernandez, the Spanish Harlem Orchestra has not finished spreading salsa and good vibes around the world.