Hands up if you know who Delia Derbyshire is. Don’t put them down yet. Keep them up, waft them gently and imagine you are conjuring a shimmering singing sound. That’s how you play a theremin, one of the first electronic musical instruments. Theremins are an abiding inspiration for my guest this week; her novel centres on the life and loves of a cellist who becomes famous in the 1920s and 30s for playing this eerie, theatrical device. Her soundtrack is an ethereal mix of Portishead, PJ Harvey, David Bowie, the classical cellist Yo-Yo Ma, and of course Ms Derbyshire, one of the pioneers of the BBC Radiophonic Workshop in the 1960s. And I also must mention that the novel (The Life and Loves of Lena Gaunt) has been nominated for several awards. She is Tracy Farr and she’ll be here on Wednesday with her Undercover Soundtrack.