This is how Ryan and the Dazzlings free the Rainbooms goes in Battle of the Bands Restart.
[The Dazzlings hurry down the corridor]
Ryan F-Freeman: Girls? Are you ok?
Adagio Dazzle: Yeah.
Aria Blaze: Why wouldn't we be?
Sonata Dusk: Now what do we do?
Ryan F-Freeman: Ok. I got my pendant. So. That makes me a siren like you. [gasps] Our siren singing? That's it! Our singing could free them.
[The Dazzlings nod. At the gymroom, the Rainbooms wait. Backstage]
Ryan F-Freeman: Okay. They are in place. [to the Dazzlings] Remember, girls. We want to save the good stuff for when the real battle gets started. Got it? [looks as his pendant glows sky blue]
Adagio Dazzle: Got it. [looks at her glowing pendant]
Aria Blaze: Ok, Ryan. [looks at her glowing pendant]
Sonata Dusk: Right. [looks at her glowing pendant]
[The curtains open and the four sirens start to sing as the song Friendship Burns Bright starts playing]
Ryan and the Dazzlings: Oh-whoa-oh, oh-whoa-oh~
Let's all come together~
Ryan F-Freeman and Adagio Dazzle: Friendship burns bright within you~
We're giving you the beat~