In 1999 she sang lead vocals on tracks "Gravity of Love" and "Silence Must Be Heard" on Enigma's album The Screen Behind the Mirror, the former of which was also released as a single.
[2] Meanwhile, she also recorded vocal samples for The Durutti Column, the Manchester-based musical project headed by Vini Reilly.
However, Boyle was considering a career in nursing by the time Kellett, who had heard the vocal samples pre-recorded onto a keyboard while playing live with The Durutti Column, contacted her about singing for the group he had formed with Taylor-Firth.
During the production of Olive's second album under Madonna's label Maverick and titled as Trickle, Boyle met Michael Cretu, mastermind behind the 1990s leading new age/pop project of Enigma, who had heard one of her songs (Miracle) in Ibiza and he invited her to participate on his fourth concept album The Screen Behind the Mirror (1999).
Boyle sang the lead vocals on two tracks on the album, one of them was released as the lead single titled "Gravity of Love" and afterward Boyle also performed as a female voice for the more commercial pop oriented Voyageur album on tracks "Boum-boum" and "Following the Sun" in late 2003.