Next from 1970 is Mona Bone Jakon by Cat Stevens.
This was the first album of Cat's "second career" as a singer-songwriter, and the first of two albums he made in 1970. Tea For The Tillerman is probably more well known, but I think Mona is the better record.
In the 1980s, Cat Stevens started his "third career" as an Islamic fundamentalist, changing his name to Yusuf Islam and and disowning his earthly career, but he's softened up a bit in recent years. Here's a recent performance of "I Think I See The Light".
Anton Barbeau and the Loud Family (all of them, including Alison & Gil) covered this song on What If It Works?, which was one of the songs on that album that definitely "worked"!