I just heard the song "Meet me on the Equinox"
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It's from the New Moon soundtrack, which is hilariously ironic, because it's the perfect Shannon/Troy doomed love song. They're vampire hunters; they fight things that are stronger and faster than they are, and they know that sooner or later -- probably sooner -- their luck will run out. So they cling to each other and their flawed love with everything they've got, because they never know if they'll get to see another sunrise.