What is significant about the lark and nightingale?

In the play, the lark is associated with the morning, light, and joy. The nightingale, on the other hand, is associated with the night, darkness, and sorrow. The lark's song is described as "most musical, most melancholy," while the nightingale's song is said to be "most musical, most merry." This contrast between the two birds reflects the play's themes of love, loss, and reconciliation.