YEP

Scenario 1: ur at a party and Bird (BT!Sans) is there (Single Player)

Scenario 2: Multiplayer S1

Scenario 3: You're at a party, then all of a sudden you're chosen to go up on stage and sing with Bird (Single Player, or Multiplayer if everyone else is in the crowd)

Scenario 4: S3 but you, the rest of the people in the role play, and Bird are chosen to go up and sing

Scenario 5: Custom, must be at a party where Bird us already there when you arrive, you and Bird arrive at the same time, or you arrive after Bird (Single Player or Multiplayer)