As much myth as musician, singer/songwriter Shelagh McDonald seemed poised to emerge as a major voice in British folk music when she abruptly vanished mere months after the release of her breakthrough LP. Born and raised in Edinburgh, Scotland, McDonald arrived in London sometime in the late '60s. While performing at the Troubadour, she befriended fellow singer/songwriter Keith Christmas, who would prove instrumental in landing her a record deal with the B&C label. Album followed in 1970 to decent reviews but mediocre sales, but 1971's Stargazer was a far different story. With...