Sequence 1, ExpositionSequence 1 (see Example 1) occurs in mm. 17–22,and forms part of the transition from the first to thesecond group. By m. 17 the Urlinie has descendedfrom ^5 (C) to ^3 (A) within a prolongation of initialtonic harmony. The sequence further extends thetonic, retaining Urlinie ^3. In the measure after the1