When Cuban composer Ignacio Peneiro wrote the song "Echale Salsite"--which roughly translates to "put a little sauce on it"--in 1933, he had no idea he had kick-started the salsa music revolution. Rooted in the Cuban and Puerto Rican immigrant communities in New York City, salsa has evolved into a worldwide phenomenon, as ubiquitous as rock and roll and jazz. Peek inside the history, people, and sexy rhythms of a music and attitude that's here to stay. Text accompanied by photographs.