Macbeth Act III, Scene v Summary

The witches again meet at an open place, this time with Hecate, the goddess of witches, who lays into the weird sisters in a lengthy, rhyming speech that sounds a bit like a nursery rhyme. She is angry at them for meddling in the affairs of Macbeth without consulting her first, as she could've done a better job. Also, she points out, Macbeth isn't devoted to them, but to his own ends.
Nevertheless, Hecate will take over the lead in the affair, and she charges them to all meet in the morning, when Macbeth will come to know his destiny, whatever that means. Hecate will create more illusions to add to his confusion, and instill in him a false hope that he might save the crown yet.
Meanwhile, some spirits sing that Hecate should "come away" with them.
Then there's a catchy witch song and dance and everyone exits after Hecate.
FYI: Some literary critics believe that Shakespeare wasn't responsible for this episode. Act III, scene iv, according to some, is far too hokey to be Shakespeare's work so it must have been added to the play some time between the time the play was first written (1606) and its publication, in the first folio (1623), which was after Shakespeare's death (1616). A fellow playwright, Thomas Middleton, may have written the snazzy songs in this scene.