"Can you keep a secret? Promise not to tell?" implores Mary Bichner as an acoustic guitar strums fast and low. "Someone's slipped me aqua toffana, to ensure I don't get well." The brooding, intense "Aqua Toffana" most likely concerns the final paranoid days of Wolfgang Amadeus Mozart. Like our doomed narrator, the maestro believed himself to be the victim of the 18th-century poison de rigueur—and pondered that the Requiem Mass he'd been commissioned to compose by a stranger was for his own funeral. As the song marches on, the desperate genius can feel the venom overtaking him, however slowly, but is weary of everybody disbelieving his claim: "If I die tomorrow, that will show you then/ Leave me to my sorrow, my bill collectors and my requiem." The song is a moody, dramatic monologue and Bichner's swooning, chanteuse voice is up to the challenge. This and three other tracks make up the brand new Fen EP from her always mutating pop project Box Five, and as with last year's Exercises in Pop, it's available for free download from Boxfive.org.