Dido's Lament by Purcell

The overall form of this piece, aside from the recit, seems to be simple binary. The theme is first introduced in the beginning or where the recitative starts in the key of c minor. There is a hc at measure five but i dont feel that the recit section has an answer to the half cadence so I term this as a phrase group. The first variation starts at 14 with another at 35. The bass ostinato i think is first evident four measures before the aria actually begins. The variation at measure 35 is a little more ambiguous with the melody, but i still feel it is evident.