At the tale end of the 70's I was introduced to this track by friends. Back then in my mind Zep were a really heavy rock band, it's only in later years as my music taste was expanding and being more tolerant of styles of music I wasn't that familiar to I can now credit Zep introducing me to plain and simple folk music. A wonderful into as the whispering guitar gains volume then Percy comes in with a fantastic vocal performance, and in the early days I never noticed the wonderful other voice. Always thought the vocals were done by Percy alone, probably always played the bloody album to loud to notice Sandy Denny add sheer beauty and depth to the track. No drums just a beautifully plucked guitar by Mr Page and mandolin to ring out and make you ache to hear more of it. Led Zeppelin the most important band in rock music? Or simple musical pioneers never the like seen of since?