I first became aware of a liking for folk music was listening to Judith Durham singing Now the Carnival is Over. My father remembers that song from when he was a POW I believe it was either a Russian or Polish folk song.

Not in any particular order:-

1) Judith Durham
2) Joni Mitchell
3) Maddy Prior
4) Stevie Nicks
5) Buffy Sainte Marie
6) Julie Felix
7) Eddie Reader
8) Melanie (sort of?)
9) Linda Ronstadt
10) Sinead O'Connor
11) Karine Polwart
12) Art Garfunkal

Must get to listen to more:-

Sandy Denny
Christy Moore
Tom Paxton