Question

Caliban: No noise, and enter. Do that good mischief which may make this island Thine own forever, and I, thy Caliban, For aye thy foot-licker. In the above lines taken from Act IV Scene i of the play, The Tempest, what does Caliban refer to by the phrase "good mischief"?

In the poem, The Darkling Thrush, the poet uses the words 'evensong' and 'carolings' to describe the thrush's song because __________.