I was just trying to organize my music collection (it's a mess) and dividing it by genres etc.. and then i thought about creating an INFP musician list. It seems logic, I have a lot of music like that.... so off the top of my head, i'd say
Elisabeth Fraser (Cocteau Twins)
For instance, Antony+Johnsons seems like a 4w5, but I think he's INFJ and there's something too Fe about his music that strikes me as different from the other INFPs. Andrew Bird also comes to mind, but that's another case of someone that I think is a 4w5 but not really an INFP.