Symphony of Sorcery

Symphony of Sorcery is a Sleeping World that is featured in Kingdom Hearts 3D: Dream Drop Distance, the second to be based on the Disney film, . The world features Mickey as a sorcerer commanding the Brooms.

Like Timeless River and Country of the Musketeers, Symphony of Sorcery is set in the past, during a period where Mickey was in pursuit of knowledge to become a Keyblade Master.

Development
Since the conception of the first Kingdom Hearts, Tetsuya Nomura had wanted to include a world based on Fantasia, but was unable to and ended up only including Chernabog as a boss in End of the World, though in a battlefield very similar to the Night on Bald Mountain segment.

Setting and Areas
Sora and Riku first arrive at a dream version of Yen Sid's Chamber, where Sorcerer Mickey is seen having a nightmare. The Tower Entrance is where they can go downstairs and get outside the Tower. Sora can enter the Cloudwalk, which takes place up in the sky. On top of the mountain is the Glen, where Sora can fly up in the air. Finally, Sora enters the Fields and gets the Sound Idea.

Meanwhile, Riku enters Moonlight Wood, which takes place at night. Once the grass is cleared, he enters the Golden Wood. Riku finds the Sound Idea at Snowgleam Wood, but is thrown into a fight with Chernabog at Bald Mountain.

Between Kingdom Hearts Birth by Sleep and Kingdom Hearts
Sometime after Terra-Xehanort's descent into darkness, his Heartless, Ansem, Seeker of Darkness, attacked many worlds and swallowed them into the darkness. One of these worlds was Symphony of Sorcery. Though it was restored after Sora defeated Ansem and destroyed the End of the World, Symphony of Sorcery remained in a state of deep sleep instead of returning to the Realm of Light, plagued by Nightmare Dream Eaters.

Sora
While carrying buckets of water in the tower, Mickey spots Yen Sid's sorcerer's hat on his desk. Making sure that no one was around, he puts it on and begins casting magic, unknowingly summoning a Dream Eater. As Sora arrives, he witness Mickey casting magic spells, bringing in a few waves, shooting stars, thunderclouds and the Dream Eater Mickey accidentally summoned, which then attacks Sora and knocks him out cold.

When Sora reawakens, he recognizes that he is in what appears to be Yen Sid's tower. However, since a sleeping Mickey, who is covered in darkness, does not recognized him, Sora guesses that he was in another dream world, of the days when Mickey was training to become a Keyblade master. Communicating telepathically with Sora, Mickey explains that a musical book has been possessed by darkness through a monster, trapping Mickey in the book and preventing anyone from entering, and the only way to defeat the darkness is to retrieve a Sound Idea. Accepting Sora's offer to help Mickey, the latter summons an unpossessed book that Sora enters with his Keyblade.

Making his way through the magical realm within the book, Sora soon finds the Sound Idea in the Fields, but was then confronted by the unknown man, who explains that he will be waiting for Sora in an area beyond sleep. Sora returns to the tower and Mickey tries using the Sound Idea on the possessed book. When it failed, Mickey concludes that one Sound Idea was not enough to rid the darkness from it. Sora reassures him, saying that he has a friend out there that was helping him and "picking up his slack". As Sora closes his eyes, another Sound Idea appears, allowing Sora to use them to create a powerful song that enhances its power to destroy the darkness in the book, although Mickey was yet to be recovered. Now being able to enter the book, Sora goes in and fights the Spellican in the Sorcerer's Apprentice area, freeing Mickey and allowing him to wake up. With his spirit back in his body, Mickey thanks Sora with a friendly handshake. Leaving to fetch the water before he gets into trouble, Mickey runs to the door, but not before bidding Sora farewell and that he will see him soon, to which the latter agrees to. After a Keyhole appears, Sora seals it, and continues on his journey.

Riku
Exhausted from fetching water up the tower, Mickey casts a spell on a broom, causing it to sprout arms and gives it the ability to move so it can do his chore for him while he takes a nap. When he awakens, he is shocked to find that are several more brooms flooding the room with water. Trying to stop them with magic, Mickey unknowingly summons a Dream Eater.

When Riku arrives at the tower, he notices the downstairs starting to flood from the water that running down the staircase. At the top, he sees room flooded and Mickey trapped in darkness. Realizing that the possessed book is responsible for it, Riku attempts to smash it with his Keyblade, but Mickey reminds telepathically him that brute force won't work. Like Sora, Mickey does not recognize Riku, but does have a feeling that they will be friends one day. After Riku offers his assistance, Mickey brings in another musical sheet and explains to Riku that in order to dispel the book of its darkness, he will need to retrieve a Sound Idea inside the other book.

Using the power of his Keyblade, Riku goes into the magical realm and finds the Sound Idea in the Snowgleam Wood, but the realm is then enveloped in darkness, forcing Riku to fall into it. Landing on Bald Mountain, Riku encounters the mysterious young man, who explains that the Keyblade picked Riku first, but due to being unable to control his darkness, he lost it to Sora. He attempts to undermine Riku by stating that his mistakes only cause problems for other people. However, Riku remains unperturbed and demands what the man is planning. Seeing Riku's determination, the man commends Riku for being able to lock the darkness within him, but adds that Riku is no longer of any use to "us". As the volcano begins to erupt, the mysterious man vanishes and Chernabog suddenly appears, leaving Riku to fight him during a dive.

Following the battle, Riku finds himself back in Yen Sid's tower and Sound Idea to try to rid of the possessed book of its darkness, but it was not enough. It was then that another Sound Idea appears to help him, creating a powerful harmony that rid of the flooding water from the room and free Mickey from the darkness. When Mickey inquires about what had happened, a grateful Riku suspects that Sora helped him. Mickey comments that hearing Sora's name makes him want to smile, and Riku starts telling him about Sora and how he can always "find the brightest part of anything, and pull of miracles like there's nothing to it". Mickey expresses his delight that Sora's heart and Riku's is always in tune and thinks it is thanks to Riku that Sora is who he is. Mickey voices his hope that he will also be part of a team someday, and with a friendly handshake, Riku assures him that he will with a smile. Afterwards, a Keyhole appears and Riku seals it before continuing on his journey.