should it be "who the fuck are arcade fire?" this is a bit confusing as its a singular group, but its made of multiple individuals, so should it be pluralized or not? where our grammar professors be at?!
Well, seeing as I don't know if the arcade fire in question is a group, or a single person, keeping it singular is better. If you do know that the subject is a group, both 'is' and 'are' are correct. In this case, 'are' would be preferred however.