Cure Melody gained the ability to summon her Belltier in episode 6, as a response to her strong feelings. The Miracle Belltier is summoned with the help of Fairy Tone Miry, and the insertion of 1 or 2 Fairy Tones into the ends of the Belltier allows Cure Melody to activate different attacks. In episode 12, Cure Muse taught Melody and Rhythm how to perform Separation, and Melody can perform her new attack, Miracle Heart Arpeggio. After spending the night at each other's homes in episode 16, the two Cures learnt to appreciate each other, and that they would become stronger by combining their powers, allowing them to achieve Crossrod, and they can perform the upgrade version of Music Rondo, as they receive each other's power, the Music Rondo Super Quartet.