Another reason they probably pre-recorded the music: There are only five of them on stage. When was the last time this band has/had performed with just the five members? They would have needed all the other backing musicians to recreate the sound they probably wanted, and that would have been super inefficient for that one-off performance, not to mention the "who are those other people?" question that would have ruined was was, for the most part, just one big photo op.
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