Final answer:
Kanye West would need a Collaboration Authorization Clause in his contract to legally perform on the new Arcade Fire album, which allows him to collaborate with other artists outside his label obligations.
Step-by-step explanation:
In order for Kanye West to perform on the new Arcade Fire album, he would need a specific provision in his recording contract with his label, commonly referred to as a Collaboration Authorization Clause. This clause would permit Kanye West to collaborate with other artists or entities outside of his contractual obligations with his own label. Without such a clause, the artist may be restricted exclusively to the label, potentially limiting collaborations due to contractual or legal issues arising from exclusivity agreements.