I went with Richard Strauss’s Elektra because (1) I couldn’t determine that it wasn’t on in April 2012, (2) it was short enough that it could have played before a late-evening gala event, and (3) it’s about a family that’s arguably even more dysfunctional than Loki’s.
(The unfinished fic, probably soon to be rendered canon-non-compliant by Infinity War, is here.)