That's sad news. One of my all-time favourite albums which I have owned on vinyl since the mid-70's and then updated to CD is Bursting at the Seams by The Strawbs.

There are some articles about his death - here are the first two I found:

Strawbs founder, singer and guitarist Dave Cousins has died, aged 85

Dave Cousins, Strawbs singer and guitarist, dead at age 80

I'll be listening to the album today.

Ave et vale, Mr Cousins.