Mortavia is correct in saying "everything" is singular, but it's a bad example because you can't replace "all" with "everything" in the track title.
As an example, which is correct: "everyone is doctors" or "everyone are doctors"? Actually, neither is; you'd say "everyone is a doctor."
Likewise, neither "Everything I Saw Was Stars" nor "Everything I Saw Were Stars" is idiomatic. If you were using "everything," you'd write that as "Everything I Saw Was a Star."
Even when "all" is referring to the entirety of something, it can be plural if that entirety is plural: "all of the pie" (singular) vs. "all of the pies" (plural), for example.
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