About time to have the Strawbs here, English band founded in 1964 mainly playing in the areas of folk and progressive rock.
This recording comes from their show at Ebbets Field in Denver, on March 4, 1974 which prominently featured tracks from the excellent Hero and Heroine published the same year. I like particularly the opening piece from that album, called Autumn.
The band is led by David Cousins, the only member from the original formation, and is still active having released in February an album entitled Settlement.
You can find (much)more about them here:
Sound Quality: 9
Source: FM Broadcast
Track List: