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Sarah Brightman is no stranger to the concepts of space and time travel. Her voice, a crystalline soprano that first mesmerized audiences when she originated the role of Christine Daaé in Andrew Lloyd Webber’s “The Phantom of the Opera,” often soars into the stratosphere on albums that bring a pop sensibility to classical music.
Now the English singer is taking her lifelong love of the celestial literally. Brightman is in training as a cosmonaut, with hopes of boarding a Russian rocket in 2015 for a 10-day journey into space, assuming she passes the final rounds of medical and psychological tests.
Inspired by that possibility, her new album, “Dreamchaser,” gathers an eclectic range of songs whose common theme is expansiveness. She tackles everything from “Ave Maria” to Cocteau Twins and Sigur Rós.
Brightman performs at Boston Opera House on Sept. 18.