Morning Dew, by Bonnie Dobson. She wrote it, and she did the original recording, which is just her and an accoustic guitar, live. This version, recorded later, in the studio, has a more emotional vocal performance. A beautiful evocation of the period, in my not so humble estimation.
There have been an enormous number of covers of this song.
This version by Nazareth takes an earnest folk song about nuclear war, and turns it into a blisteing, trippy, fuzz blues, acid-rock jam. Such strange permutations.
The weirdest thing is that until about 48 hours ago I had never heard of “Morning Dew”. I have been a devotee of rock and pop of the 1960s for the last 35 years or so, but this song, which has the status of a standard, has been under my radar all these years.
In a way, it is good to know that I have not exhausted the riches of that era.