Idk if I would peg Mary Coughlan as a jazz singer, or even that jazzy really. She kind of reminds me of a category that would encompass Mary Black, Kirsty McCall, Shawn Colvin, for example. Non-traditional singer-songwriters whose lyrics place them out of the mainstream but not into the jazz standards classifications; e.g. Julie London, Diana Krall, or Nina Simone.
@mahgister - I’m always impressed by how eclectic your music taste is!