Gretchen Wilson may not be one of country music’s top female vocalists any longer. No, she’s transcended the genre, in a way Alison Krauss did hers years ago. Except Wilson’s not getting any of the recognition, until maybe now. ‘One Good Friend’ is a brilliant ballad about the meaning of friendship. However, it’s perhaps too professional to fit between the stars on modern country radio — a problem Krauss, and more recently Vince Gill, know very well.