Measures 9-18 of this aria show a parallel period with asymmetrical phrasing. The first four measures (9-12) have a phrase that ends in a half cadence. The consequent phrase then takes up the next six measures (13-18) ending in an authentic cadence. The second phrase has a cadential extension repeating the rhythm of the measure previous to it and then finally ending in the next measure.
The structural phenomena of this piece is quite dull, but then again this is opera, and opera is boring. Totally kidding...vocalists please don't kill me. The aria starts in A and stays that way throughout the period. The dynamics stay at piano throughout the whole piece, although when I listened to it the dynamics varied more than the score says. Tempo is slow all the way through, and meter does not change. I'm not sure if we're supposed to talk about the measures selected or the whole piece but there are some register changes from bass cleff to treble cleff and back to bass clef. This gives some contrast in the accompaniment since alot of the aria is the same 16th to dotted quarter then 16th again back to dotted quarter pushing the listener to stay interested.