The Firebird (French: L'Oiseau de feu) is a 1910 ballet by Igor Stravinsky and choreographed by Michel Fokine. The ballet is based on Russian folk tales of the magical glowing bird of the same name that is both a blessing and a curse to its captor, says Wikipedia.
Stravinsky's ballet centers on the journey of its hero, Prince Ivan. Ivan enters the magical realm of Kashchei the Immortal; all of the magical objects and creatures of Kashchei are herein represented by a chromatic descending motif, usually in the strings.
While wandering in the gardens, he sees and chases the Firebird. The Firebird, once caught by Ivan, begs for its life and ultimately agrees to assist Ivan in exchange for eventual freedom.
Next, Prince Ivan sees thirteen princesses, with one of whom he falls in love. The next day, Ivan chooses to confront Kashchei to ask to marry one of the princesses; the two talk and eventually begin quarreling.
When Kashchei sends his magical creatures after Ivan, the Firebird, true to its pledge, intervenes, bewitching the creatures and making them dance an elaborate, energetic dance (the "Infernal Dance"). The creatures and Kashchei then fall asleep; however, Kashchei awakens and is then sent into another dance by the Firebird.
While Kashchei is bewitched by the Firebird she tells Ivan the secret to Kashchei's immortality and Ivan destroys it killing Kashchei. With Kashchei gone and his magic broken, the magical creatures and the palace all disappear, and all of the "real" beings (including the princesses) awaken and, with one final fleeting appearance from the Firebird, celebrate their victory.