This is how Space Song puts the Rainbooms under his spell goes in Battle of the Bands Restart.
[Rarity and Crash run]
Crash Bandicoot: We've gotta hurry, Human Rarity.
Ryan F-Freeman: I hope the other girls are okay.
Mike: Don't worry, I'm sure they're fine.
Evil Ryan: I'll use these. [pust the geodes on his necklace]
[Evil Ryan transforms into
[Space Song peers round the corner]
Space Song: Time for those Rainbooms to see what happens when you mess with Sirens.
[Space Song goes up to them]
Twilight Sparkle: What do you want?
Space Song: Just to sing a little song to you all. [vocalizes]
[Space Song uses his magic to put the Rainbooms under his spell]