Quite a tricky question, but the ones that are closest are Folk Rock or Alternative.
It's hard to pick a particular genre, they seem to trip through them with much ease. I would call them Folk Rock or Folk Alternative.
Martha wainwright is an alternative/folk rock artist currently residing in Brooklyn New York.
The Hot House are an Irish band that have been active for more than 25 years. They genre of of music they do are Alternative Rock, Folk Rock and Celtic Rock.
Suzanne Vega is known for being an American singer. Suzanne Vega was born in America on July 11, 1959. Her music styles were folk rock and alternative rock.
Michael Stipe draws influence from folk rock bands from the 1960s such as The Byrds and Big Star. He also was influenced by alternative rock bands from the 1980s like The Smiths.
I would say that Coldplay is a Softrock, Alternative band. That's at least what they say about themselves
Alternative Rock/Grunge
folk/ pop and rock folk/ pop and rock
Folk, folk-rock, pop, rock
Some songs are pop,alternative,and rock. Katt§
Red Rock Folk Festival was created in 2003.