In "Animal Farm", why does Old Major call a meeting?no

Old Major calls the meeting to share with the animals his dream of a utopian society without man.  He believes that man is the cause of all the problems animals face, and without him, animals would be able to live freely and in comfort to the ends of their natural lives.  Old Major teaches the animals a revolutionary anthem entitled Beasts of England, and urges them to rise up against their oppressors and chase them away.  Once the animals have released themselves of the dominion of man, Old Major outlines the principles by which they should live.  He warns the animals passionately that, in their struggle against man's tyranny, they should be careful never to become like him - they should "never live in a house, or sleep in a bed, or wear clothes, or drink alcohol, or smoke tobacco, or touch money, or engage in trade...no animal must ever kill any other animal...all animals are equal" (Chapter 1).