When the Colorado Springs Symphony filed for bankruptcy last week, Lawrence Leighton-Smith, the group’s music director, quit, as he had said he would. But the orchestra says it won’t accept his resignation, and that he is obligated to stay on by terms of his contract. Meanwhile, the orchestra has refused to distribute parts to its players for next weekend’s concerts while musicians have refused to sign a cost-cutting agreement. Kind of difficult to have a concert without music scores.