Country music’s Sugarland is enjoying a No. 1 album in “Love on the Inside,” but on the outside, there is litigation. The two members of the Atlanta-based group, Jennifer Nettles and Kristian Bush, have been sued by their former musical partner, Kristen Hall, for $1.5 million in federal court.

Hall, a folk musician and one-time Indigo Girls’ roadie who founded Sugarland, claims that she has an existing partnership agreement with Nettles and Bush dating from 2002 in which they agreed to share profits and losses equally. Hall also alleges that she created the name Sugarland and agreed to “contribute” the trade name, trademark and service mark to the partnership.