Manhattan-born and raised Rachel Nicolazzo (aka Rachel Z) had music practically ingrained in her genetic code. Groomed to follow in her mother's operatic footsteps, she began voice lessons at two, started classical piano lessons at seven and attended the opera by age nine. "My first dollhouse was a Metropolitan Opera House complete with the stage and dolls which were the performers," she recalls. "Then I heard Miles Smiles when I was 15, started rebelling against the classical by improvising...