Here is how Prologue: The Dazzlings and The Siren King goes in Dazzling Songnotes of Silver.
[We see The Dazzlings in an alleyway]
Aria Blaze: This sucks so much, With our pendants destroyed, we can't sing or cast our spell on someone.
Adagio Dazzle: Well, duh, of corse we can't thanks to those stupids half-pony riots. (She then tosses a pebble into a rusty tin can.)
[A formally dressed cloaked figure walks out of the shadows]
The Cloaked Figure: And I suppose you need someone to help you with your dilemma.
Sonata Dusk: Do we know you?
Aria Blaze: Now that you mention it, there is something oddly familiar about this guy.
[The Cloaked Figure then pulls back his hood to reval his face, which The Dazzlings recognize him as King Silver Song, their mentor.]
The Dazzlings: King Silver Song!
King Silver Song: That's right, and together we can and we will make everyone in this world adore the four of us.
Sonata Dusk: But we've lost our pendants. And now we can't sing beautifully like we used to.
King Silver Song: How did it happen?
[The Dazzlings the tell King Silver Song about how they witnessed the Equestrian magic in the human world and what happened at the Battle of the Bands.]
King Silver Song: I see, If Equestrian magic has made itself present in this world then I might be able to give you three your powers back.
Adagio Dazzle: And make The Rainbooms pay.
King Silver Song: Indeed, Now come we have work to do.
[The four then walk out of alleyway.]