This is how Space Song arrived and Rarity looks up her shoes goes in Battle of the Bands Restart.
Space Song: There must be something here to help me with my problem.
[He sees the Rainbooms (exclude Rarity)]
Space Song: What are they up to?
[He spies on them]
Human Twilight Sparkle: Alright, girls. You know what to do.
Human Rainbow Dash: Yeah, that Rarity was too worried about her shoes.
Human Twilight Sparkle: Probably so worried she couldn't be bothered to show up.
Human Pinkie Pie: Yeah.
Space Song: Perfect.
[So, Space Song waits for his signal]
[Meanwhile, Rarity was daydreaming again]
Bertram T. Monkey: Rarity? Can you help me?
Human Rarity: Sure.
Bertram T. Monkey: Why are you daydreaming?
Human Rarity: Because I was just
Bertram T. Monkey:
Bertram T. Monkey: There might be a new guy. A siren.