Singer-songwriter Jonatha Brooke plays a special free show tonight at 8 at Finney Chapel with the Cello Songs Project, a group that features Oberlin Conservatory graduate Rebecca Arons. Both Massachusetts transplants these innovative, Minneapolis-based musicians have worked together since early workshops of Brookes's award-winning off-Broadway show My Mother Has Four Noses. Along with guitarist Sean Driscoll, they will pay new arrangements of Brookes's poetic folk/pop songs.