Check showtimes when you enter the park for the day. Be sure your entire party is present before entering the Hanger Stage. There are is no seat saving allowed. There is a strictly enforced rule of no photography or video recording during the show.

How's It Different From the Walt Disney World and Disneyland Versions?

Song of Mirage is exclusive to Tokyo DisneySea

Is it English Friendly?

Dialogue is in Japanese, but the story is simplistic enough to follow, and it mostly relies on visuals anyway.