Large groups versus small groups

What are the relative advantages and disadvantages of large groups versus small groups? Consider the performance of the individual and the effectiveness of the group, as well as the overall task being accomplished. For example, consider the difference between a symphony orchestra (large) and a baseball team (small). How is working in a large group different from working in a small one? Why do some tasks require a large group and others a small group? As you write your response, take into account your own group experiences