The ninth movie in the series was titled The Swan Princess: Kingdom Of Music. The producers of the series referred to it as "Swan 9". It was released on DVD and Digital on August 6, 2019. It's release was meant to coincide with the 25th anniversary of the original movie and be a second movie in the series to be an anniversary special after "A Royal Family Tale".
Princess Odette was hosting a music competition to celebrate Princess Alise’s birthday and coming of age ball. The winner would sing at her grand birthday ball! Prince Li of Cathay entered, but his sister, Princess Mei Li stowed away on his ship to seek help from Odette and Derek for Chen who was cursed to live as a dragon. Lucas and Alise are reunited, but Prince Li’s arrival made Alise doubt her feelings. While Li and Lucas fought for Alise’s heart, Derek and Odette tried to help Mei Li and Chen break the curse. Who would win the music festival and would Chen ever be free from his curse?
In a faraway kingdom, the Cathay Empire ruled by the Divine Emperor of Cathay and father of the royal twins: Prince Li and Princess Mei Li. Prince Li was going to sing at the Swan Princess Music Festival Competition along with the other groups who would also join the Festival. Princess Mei Li had a boyfriend named Chen who was under a spell forced to live as Dragon. Their father, the Emperor, gives a present to Li to bring it as a gift to the Swan Princess (Princess Odette). Overhearing the conversation she runs out to meet Chen to tell how they can break the evil spell with Princess Odette's help. Chen gains his human form by sunset for only a few moments. But Chen disagrees at first thinking that it's only a dream or something else.
At the Chambers, Prince Li is preparing his things to sail to the Swan Princess Festival. Li feels so sure that he will win and he wished that his sister may come to see him sing. But Mei Li refuses. The next day Mei Li stows away and sneaks inside one of the lounges from her brother. Ru his loyal friend and servant noticed that but he didn't say any word. While hiding Mei Li watches Chen flying close behind the ship.
Meanwhile, at the Kingdom, Queen Uberta is observing how Lord Rogers shows the participants the statue of Scully, the brave Scullion who saved Princess Odette from the Forbidden Arts and so many dangerous moments. Lucas has now grown into a young man and meets Alise who is as she is practicing on the harp. Lucas gives Alise tulips the same flowers he gave it to her when they were children. As Prince Li arrives at the Kingdom while Alise and Lucas were playing but she has to leave to meet the Prince. Prince Li gives Odette the box and Alise gives him a cattail which he inhaled the dust causing him to cough and Alise laughs at him making Prince Li very angry. Mei Li sees Odette and she knew she is the one who can help. Alise and Prince Li don't seem to like each other. That night Mei Li enters the Castle to search for Odette where Chen also was. Mei Li explains to Odette and Derek about the spell. They promise to do whatever they can to help them.
Soon the contestants are presented by Chamberlain. Chamberlain announces Princess Odette, she explains the winner will sing at the coming of age ball of her daughter. Humbelani, one of the finalists is the first one to make his performance and tires his best and when ended his show everyone enjoyed it but Alise unintentionally says out of loud to Lucas that everyone could win except Prince Li and the audience goes quiet. Li leaves feeling hurt and very angry.
Queen Uberta tells Alise that she must apologize to Li for her behavior. So the next morning Alise and Prince Li meet and as he sees Alise's harp, saying that he had something similar in his kingdom. Prince Li plays the Harp, but he explains to Alise smiling: "Our strings are arranged the opposite way." Alise is very surprised by the way he plays the instrument and listens to him. Li tells her that his father made him and his sister practice every day but Mei Li refused to continue, seeing it as too difficult. Alise joins playing the harp with him witch, Li is surprised to find they have something in common, and both play in sync as a Har`Duet, leading them to fall in love with each other. As they finish Alise apologized to Li for the way she acted and how she treated him, and Li decided they start over by introducing himself again and Alise welcomes Li, leading him to kiss her hand in witch she liked it very much. Lucas witnesses this and becomes jealous.
Meanwhile, Mei Li, Odette, Derek, and Chen go to Swan Lake the place where Prince Derek confessed his romantic feelings to Princess Odette when she was under Rorthbart's swan spell. Odette and Derek explain that he was tricked by Bridget causing Odette to die. Using the same words that Derek said to Odette, Mei Li tries to break the spell but nothing works and Chen is forced to turn back into a dragon.
Derek thinks that the only one who can help them is Scully. Scully agrees to help them as well and he found something to break the spell. He needed Blood of a dragon. So Derek tries to use an arrow and some blood left Chen's body. As he drinks his own blood, he's still a dragon.
Scully must go to the Cathy Empire to find something. An evil sorceress was the one who probably cursed Chen. Scully tries to read something in Chinese. As he remembers what was written, He tells Derek that he should write what Scully has seen. As Mei Li reads it, she is horrified that a child has to sacrifice something special. Alise and Prince Li are now good friends and when one of the finalists finished the performance, both take a walk near the lake. Prince Li explains that he never knew his mother, she died when he was very young, and Alise had lost her mother as well. Li discovers that Alise's adoptive parents are the prince and princess (Prince Derek and Princess Odette), and she had lost her first parents.
Li gives Alise his condolences and Alise admits she wished to know her mother and she misses her father every day but to get a second mother and father that are so kind and loving, her life is much kinder than cruel to her, and Li says: You deserve your good fortune. Alise wanted Li to explain about his father and when he tells her that his father loves him, but he can be very strict and that his twin sister defied his wishes and he broke her heart in return. Alise and Li were wrong about each other and as he is about to leave, he takes Alise's hand and bids her goodnight.
The next day, Prince Li and Alise are horse riding together and Alise is impressed by his riding tricks and when both are stopping near a bridge, they wanted to try the first kiss but Lucas, who is still jealous, he interrupts their romantic moment. Alise found out that Lucas was the one who interrupted them. Alise said that she now liked Prince Li which left Lucas heartbroken because he thought that he and Alise had something more. Back at the castle, Li tells Ru, that he's in love with Alise. He says at first she was insufferable, but Ru uses the correct word to help his master, suffer-able. Ru reminds Li of the promise he had given to his father and Li is certain of it that he will the competition and also the heart of Alise.
Soon the competition is about to start but Chen is still a dragon and Mei Li is unhappy. They tried everything to break the spell. Mei Li screams that she will surrender her love for Chen which saddens him and says that Mei Li must find someone else to love and leaves. Mei Li collapses and Odette and Derek take her to the castle.
At the finals, Li is the last one to sing and he sings a Chinese ballad for Alise. Odette makes the announcement and the winner is Prince Li. Prince Li is very pleased and very happy to fulfill the promise that he made to his father and, Alise runs to him giving him a big hug and tells him she knew he would win. Mei Li is happy but sad at the same time. Prince Li is now the winner and so he will sing at Alise's birthday. Lucas was then determined to win Alise's heart back and asked Lord Rogers to teach him to dance. Unbeknownst to them, Prince Li was watching them and heard that Lucas wanted Princess Alise back. Alise showed Prince Li to Lord Rogers Secret Lair where he took Alise and Lucas there as a spy team and Alise remembers those good old times. Prince Li realizes that while they were in the spy room as Alise kept talking about Lucas.
It was then time for Princess Alise's ball. As the first dance was about to start with Prince Derek and Alise, Li sees Lucas walking away in defeat and decided to make the ultimate sacrifice of losing his love. He asks Queen Uberta for permission to break a tradition just this once and let Lucas dance with Alise, much to Lucas' surprise. Alise was reluctant to dance with Lucas because of their argument but she does in the end. Prince Li sings and the same song in English and as Lucas and Alise are dancing together, Chen appears. Alise and Lucas finally realized their love for each other and kiss. Because of Prince Li's sacrifice, Chen's curse has been lifted and be with Princess Mei Li. Ru was very proud of the prince's choice and told him that his sacrifice helped his sister lift Chen's curse. The following day Prince Li says goodbye to Alise who are now good friends and both will never forget each other. As Prince Li was leaving he took one final glance at Alise who was running towards Lucas and heads off. At the very end of the movie, it can be read: To be continued.
- Nina Herzog as Princess Odette
- Yuri Lowenthal as Prince Derek
- Joseph Medrano as Lord Rogers and Scully
- Jennifer Miller as Queen Uberta
- Clayton James as Jean-Bob.
- Doug Stone as Speed
- Gardner Jaas as Puffin
- Bleau Essen as Alise
- Grant Durazzo as Lucas
- Francis Huang as Prince Li/ Captain of the Guards
- Shephanie Sheh as Princess Mei Li
- Alex Chen as Chen
- Brian Nissan as Chamberlain/ Ferdinand/Brodie
- Dick Stanners as Chamberlain Announcer
- Catherine Lavine as Bridget
- Geogre Ju as the Divine Emperor
- Ben King as Ru
- Lynna Yee as Fang
- Kirby Leigh as Scullions
- Emily Pearson as Princess Anya
- Charan Prabhakar as Prince Samar
- Rebecca Lopez as Princess Isabella
- Yaosh Bonner as Prince Humbelani
- The Japanese Title is called (スワン・プリンセス 音楽のファンタジー Suwan purinsesu ongaku no fantajī).
- Bromley is not seen in this movie but his name is listed on Alise's dance card.
- In this movie Alise plays the harp, and later she shares her harp with Prince Li one of the groups of the Swan Princess Music Festival and both the harp as a Harp Duet and fall in love.
- Odette's outfit chances and wears a beautiful white dress with a transparent cape on her back.
- Alise is involved in a triangle love between Prince Li and Lucas.
- The Song Goodbye is sung by Prince Li in Mandarin and English.
- Mei Li and Chen are seeking for help on Derek and Odette to break Chen's spell as he is turned into a firery dragon and gains only him human form when the sun is almost setting for a couple of minuts before turning into a dragon.
- To break the spell on Chen is that a Child of the emperor must surrender true love.
- Alise has her own horse and she and Prince Li are horseriding and Alise is impressed at Prince Li's riding tricks.
- Alise takes Prince Li to Lord Rogers secret Chamber as she shows him all the spy gadgets that she used when she was a spy along with Lucas when she was a child.
- Shaka Boom sung by Humbelani
- Vecherinka sung by Anya
- La Cascada sung by Isabella
- Show Your Colors sung by Samar
- Goodbye sung by Prince Li (Mandarin & English).
- A sequel directly following The Swan Princess: A Royal Wedding this will come out to DVD in Summer 4th of August 2020, it was approved by Sony.