Back in the mid-1990's, along with Van Der Graf Generator, I also got to know another early- to mid-1970's British prog band. They released their first album in 1969/1970, and never really made it on this side of the Atlantic. Like King Crimson, their initial album offered a pretty mature version of their sound (unlike, say Yes or Genesis, whose sound continued to change over the years as musicians came and went). Like Renaissance, they also had a female lead singer. Curved Air is not for everyone, but I find them refreshing, even in these old TV clips which do not do their music justice.