According to Wiki, Annie Haslam answered an advert in 'Melody Maker' and auditioned for the band Renaissance and in 1971 she became the lead singer of the second incarnation (or rebirth if you like) of this 'folk rock' band. (folk rock? crossover? progressive rock? - hard to tell, all sorts of names have been attached to them and other bands but the music is the only thing that matters, labels are for the cloth-eared.)
Forty-seven years on they are still touring and her fabulous five octave voice sounds as good as it ever did!