and third 1974 stories, "Prelude to a Crystal Song" and "Milekey Mountain". In the second and fourth original stories she is a veteran of more than 100 years in the field. Whether and how she may be able to go on as a woman on vacation (#2) and as the miner of her claim (#4) are primary themes. Killashandra is a small town in north central Ireland, about 120 km northwest of Dublin. "Milekey Mountain" was adapted in comics form (artist uncredited) in the 1979 publication Questar: Illustrated Science Fiction Classics (Golden Press, ISBN 0307111970). This adaptation also included material from the first two stories in order to provide an "origin story" for Killashandra. In Questar the story was retitled Crystal Singer. Plot summary (1982 novel) Killashandra Ree has spent ten years studying music and training to be a vocal soloist, anticipating interstellar celebrity. After a final exam she learns that a flaw in her voice will prevent her from singing lead. She dreads a life limited to choral work and supporting operatic roles so she plans to exit both school and home planet discreetly. At the spaceport she meets a vital older man who uses perfect pitch, and his occupational experience as a "crystal singer" on Ballybran, to identify an incoming space shuttle on the verge of explosion. He treats her to a whirlwind romance and the experience of her home planet in ways entirely unknown to her, but sincerely warns her against the high-status, high-income occupation that makes such a vacation possible for him. Further, one of its occupational hazards leaves him in a coma, but Killashandra determines to accompany his return home under life support, and to investigate membership in the Heptite Guild of crystal singers for herself. The crystalline rock of Ballybran, when skilfully cut, is essential to advanced power and communications systems at the heart of interstellar civilization. Only the Guild "singers" can mine crystal: locate it, and cut it with voice-controlled machinery. Killashandra's ability to sing perfect pitch meets one qualification, she knows, and she passes other qualifying exams in the staging area on Ballybran's moon. Travel to Ballybran itself, however, is forbidden to all but its resident singers and supporting population, about 30,000 people. The moon-side orientation program secretly explains why: a native spore soon invades the human body and causes genetic mutations. Some newcomers will die of the initial infection and many