I think it was in the year-end edition of Rolling Stone, in 1976, that I read a review of this album -- not in the regular review section, but in an editorial by Jann Wenner. He identified Silly Sisters, and Chirpin' by the Persuasions, as classics, true, honest and destined to last forever. He was right on all counts for both recordings, but I listen to Silly Sisters far more often these days.
This is a sublime album, built on the strengths of two masters of British folk, accompanied by a host of other instrumental masters. There are any number of highlights, but among the standouts: "Grey Funnel Line", as gorgeous a dirge as you'll ever hear; Four Loom Weaver, the most beautiful incitation to class warfare you'll ever hear; and "Game of All Fours", a light rolic made hugely attractive with erotic overtones (and undertones and between tones).
For more than thirty years this has been one of my favorite recordings. I have 12000+ songs on my system, and the Silly Sisters collection is still played regularly. Treat yourself, buy the songs.