Best response to the Vienna Game (C25)

1. e4 e5 2. Nc3 · Black to move

What is the best response to the Vienna Game (1. e4 e5 2. Nc3)? Black to move. See the top replies ranked by opening theory and real-game results, starting with Nc6.

The main theoretical reply is Nc6, reaching the Vienna Game: Max Lange Defense.