I would be interested in other peoples opinions as to guidelines.
Here is my opinion.
1.Explain what category of Folk music, e.g, Traditional American, Contemporary English Self composed in a traditional style, or whatever.
2. Mention instrumentation.
3. Do not make derogatory or smart arse comments without qualifying or explaining THE COMMENT, such as this LP is Only fit to use as a flower pot,or agit prop my arse., or I tried not to let it wash over me but it did.
4.Give people information in an objective way as you possibly can .
5. Do not agree to do a review, if you have a personal dislike of the artist.
6. Remember that your love of music, and that promotion of folk roots music,is more important than anything else, including writing purple prose,OR personality clashes.
7. When you have written the review, put yourself in the position of the person who you are reviewing,and imagine how it must feel, to have your music rubbished.