Today is the anniversary of English singer/songwriter Sandy Denny’s untimely demise. Here she is in 1969 as a member of Fairport Convention with a mysterious recording of ‘A Sailor’s Life’, a song that (in its released version with fiddler Dave Swarbrick) more or less started ‘British folk-rock’, the genre that never quite goes away. This version is mysterious in that the standard tale for years was that Swarbrick joined the ‘Vench in a studio and instantaneously created a magic improvised duel with lead guitarist Dicky Thompo. But then this acetate of a presumably earlier version recorded without Dave turned up 30 years later. Happily, it’s also sensational.