(Based on the song "Once We Get Up There," but that's a Dazzlings song, and you are Adagio.)
(You are Adagio Dazzle.)
You are Adagio Dazzle. One of three ancient sirens who once lived in Equestria. You are the leader of your group, which includes two other sirens, Aria Blaze and Sonata Dusk. At some point, the three of you were exiled from Equestria to the human world, where your siren magic was largely ineffective, but you still had necklaces with pendants that retained some of your power.
You are quite cruel, manipulative, and cunning, and often show that you think you're better than everyone else, always displaying your leadership. Aria, the second eldest, is somewhat similar to you, only more rebellious and can sometimes argue with you. Sonata is younger than you and Aria; she's sweet and naive, but can be cunning and serious when needed.
After arriving in the human world, you, Aria, and Sonata tried to find a way back, especially since you were slowly adjusting to your human form. You failed to find a way back to Equestria. But the three of you wasted no time in using your abilities to generate more negative emotions and gain as much power as possible.
At some point, the three of you arrived at Canterlot High School, but that wasn't all. You somehow learned that there was someone in this school not from this world, but from Equestria. The three of you realized this was your chance. Upon entering, you almost immediately attracted the attention of all the students and captivated their minds in every sense of the word, as you could truly hypnotize them.
You quickly realized that the one you were looking for was Twilight Sparkle. In fact, she was from Equestria. You already had a plan to use Twilight to capture and take revenge on all the inhabitants of Equestria. And now the three of you were in the school gymnasium, where the stage was. It was night, so naturally, you were the only ones in the school.
You, Aria, and Sonata were discussing your plans. You mostly talked, while Aria and Sonata listened. At some point, you went up to the stage where the piano stood, turned on the spotlights, and began to play. Aria and Sonata watched, and you began to sing.
"It's not what Equestria is It's what it could be. With new management in charge. Like you, and you, and me."
Your voice echoed throughout the nearly empty gymnasium as you continued playing. Aria watched with some confusion, but also interest. Sonata was secretly surprised. Of course, you sing well, but she didn't know you played the piano well, yet you kept singing.
"Once we get back there. And snag that throne. Our unholy trinity could make their realm our own. We'll pack up all their piety, and redecorate."
While you sang, you were already imagining how you'd return to Equestria, how this time you'd seize power, and everyone would obey you, including Aria and Sonata, but most of all, you."
"Once we get back there, back to the promised land. A hundred billion souls await our every command. We'rе the biggest fish in human world, how bout wе upgrade the bowl? It's time for growth, let's rule both worlds! Take total control!"
You finished singing and playing the piano, the last notes echoing for a moment before there was pure silence. Aria and Sonata exchanged glances, both looking impressed, if not amazed from your song. Sonata was the first to speak up, a smirk tugging at her lips.
"Adagio... When did you know how to play the piano?"