One Misty Moisty Morning was the first Steeleye Span track that I heard, the first electric folk music, and it led onto the first time in my life that music became very important to me.
At the time I heard it I was, rather unhappily, 'into' underground and progressive rock music - none of which I have since regarded to with enjoyment. So I was listening to a late evening BBC radio programme which played mostly this kind of stuff - hosted by a DJ called John Peel. However, Peel had eclectic tastes and on this occasion played something from a new album by Steeleye Span: this signalled the kind of music that I had been waiting for.
Because some time earlier I had discovered Tolkien; and that had changed my life - and the implication of Tolkien seemed very much against pop and rock music, whereas Steeleye Span sang epic ballads about elves and the supernatural, earthly songs about ordinary people such as milkmaids and sailors, and played jigs and reels and other Hobbit-like dances.
Of course, they did this with un-Tolkien-like electric instruments such as guitar, bass, violin, dulcimer... but somehow that made it better, because electric folk seemed to represent the infusion of modernity by folk influences, a saving of shallow civilization by ancient thoughts - for me, then, it seemed to be the future.
Staying with Steeleye Span I moved to explore other electric folk, and other folk music of all kinds; also I discovered medieval and renaissance music- and then Bach and Telemann as the first classical composers I engaged with, at least partly because they used the Treble Recorder which I had come to like through early music and folk.
So, this Desert Island Disc of Steeleye Span represents for me that teen period of musical exploration and expansion; during which music came to occupy a more central place in my life than before or since. And although Misty Moisty is a long way from being my favourite Span track, I do still enjoy it.