I did guess correctly (I think) on Questions 1. Artisan 4. Planxty 5. Lau 8. Mamas and Papas 10. Band 12. Proclaimers 13. Oyster Band 15. Strawbs 16. Fairport Convention 17. Kerfuffle & 20. Show of Hands. The others apart from 7. Cry Cry Cry which I had a inkling of due to researching Lucy Kaplansky for Shrewsbury FF. I won't list the others.
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sj