I wrote a paper on Gaelic singer/folklorist Mary Jane Lamond (Sleepy Maggie) when I was in University. I read many articles and interviews about her, watched documentaries and followed her work for years. I recently realized she's probably a very complex type of intuitive, and still can't "label" her.
Even though Mary Jane Lamond is a singer, she dislikes the limelight. She had never considered becoming a professional singer before a door opened up and she walked in mostly because she was asked to help on a couple of musical projects in her community. She is far from anything show-off and shows a surprising sobriety on stage. Every concert is turned into a philosophy class about how modernization affects a poetic tradition and how a culture can be transformed by social changes, etc. You always feel like you've learned a lot after you've seen her perform. She also offers Gaelic workshops that are done in more private contexts, so I'm pretty sure we can say she is Introverted and Intuitive.
Having met her, I can also say there is definitely a NT vibe about her. She is cold, rational and straightforward and is definitely not the sweet type of woman. I also know her father is a INT engineer, so there are good chances she would be NT.
There is a problem though. Mary Jane Lamond's work is social work. She is very involved in her community and really seems to care about the people she works with. I recently found out she participated in the Green Party of Canada's last campaign in Nova Scotia. Folklore and ancient languages is not something an NT would care about either, is it? All this makes her sound like a NF. There is also the fact that NFs have this talent and interest for language, and Mary Jane Lamond once considered becoming a linguist before this singing career fell in her face.
I've read some descriptions of the introverted NFs appearing as cold and distant because a lot of stuff is happening inside, but can you be this cold? (Mary Jane Lamond's way would appear like anything but NF).
My conclusion is that she might just be one of those rare INXs.
As for the the J/P, I have no idea. I would say she sounds much closer to P, because she has pretty good artistic taste and takes her time to finish up a project.
So... INXP ?
Man, this icon is so cool.