Starting in 1956 some very early Brenda's recording's pity that it only goes up to 1966...her voice definatly changes through the years see my other post of hers !!....Even in the 10 years that this L/P covers you can hear the diference !!!..and of course the type of songs do make the difference..from 1961 on they are less frantic !!...so the sound bite is the 1956 one to give you a taste!!