User Recommendations for Sword Art Online

So basically both series have people involved in some kind of "game". The servants in fate zero are similar to the game avatars in SAO because they both have abnormal super natural powers. The music for both of these anime are made by Yuki Kajiura

The soundtracks for SAO and Fate/Zero sound very similar. Both are filled with great dramatic themes as well as light sad tunes. They are both of course composed by the legendary Yuki Kajiura. The two shows also have equally superb action sequences and animation.