I've Always Kept a Unicorn tells the story of Sandy Denny, one of the greatest British singers of her time and the first female singer-songwriter to produce a substantial and enduring body of original songs. Sandy Denny laid down the marker for folk-rock when she joined Fairport Convention in 1968, but her music went far beyond this during the seventies. After leaving Fairport she formed Fotheringay, whose influential eponymous album was released in 1970, before collaborating on a historic one-off recording with Led Zeppelin - the only other vocalist to record with Zeppelin in their...