Olivia Ruiz

One freezing, dark winter’s night in 1874 in the Scottish city of Edinburgh. A young boy called Jack is born on the coldest night the world has ever known and his heart is frozen solid. The midwife overseeing his birth, who happens to be a witch, comes up with the idea of replacing the child’s defective heart with a ticking clock. So long as he avoids powerful emotional shocks in his life, such as love or anger, he will live a normal life. But one fateful day, Jack looks into the smouldering eyes of a beautiful young street singer…
Thus starts La Mécanique de Mon Coeur, both an album and a book by Mathias Malzieu and his band Dionysos. Call it a concept album, or a pop opera. It's a take on the Jack the Ripper story, the album is the soundtrack to the book. Characters are voiced by Arthur H, Emily Loizeau, Dionysos themselves and Olivia Ruiz, who plays the beautiful young street singer. She features on four tracks.
The Dionysos-album with Ruiz battles in the charts with Olivia's own live-cd Chocolat Show, that features three duets. One with Malzieu, one with Christian Oliver and one is with her father Didier Blanc, a professional singer and musician who belongs to a ‘tribe’ of music aficionados who had originally come to the south of France from Spain. That is why the song is in Spanish. The live album is very energetic, with references to klezmer and punkrock.
Olivia has a thing for doing duets, I've added a few other examples. On her Wiki you can see every collaboration (yes, the one with Adamo is on Filles Fragiles!)

Dionysos feat. Olivia Ruiz - Tais Toi Mon Coeur
Olivia Ruiz & Didier Blanc - La Molinera (live)
Alain Leprest & Olivia Ruiz - Êtes-vous là
Weepers Circus & Olivia Ruiz - La Renarde
Bratsch & Olivia Ruiz - L'almée phénomène