Verdi's reply to Cammarano on 17 May outlines some of his concerns; these revolved around the shift of some elements (especially in act 2) and the addition of a duet for Walter and Wurm. As Budden notes, "the only one of these points on which Verdi got his way was the new duet" (because the librettist raised various objections regarding the conditions at the San Carlo and various others), but Budden emphasizes the "spirit of give and take" which prevailed through their relationship. One example regarded the ending of act 1 where Verdi emphasized that there should no stretta, and the librettist agreed provided that "the act did not end in slow tempo but should quicken towards an animated finish."(See "Music" below).