Easily the strongest movie sequel ever. The acting, writing, and score are done as well as it can get. Al Pacino delivered a performance of a lifetime yet didn't receive an Oscar. What this sequel does well is it's in perfect continuity with the first movie, yet it creates it's own story that fascinates the audience. And it provides the necessary backstory for Vito and the Corleone family which is perfectly paralleled with Michael's storyline in present times.