So I heard Crow whistling this one time and I thought "Oh, that's cool! He's whistling the theme to Shadowkeep!"
But apparently he's actually whistling Savathûn's Song? Are the main theme of Shadowkeep and the Song the same?
[spoiler]I don't have the doggoned expansion so if that was part of the story, I didn't have a chance to see it.[/spoiler]
Otherwise, my thought would be is that Bungie inserted a cool little Easter egg and a nod to the last expansion.
[spoiler]Happy Easter![/spoiler]
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They are the same song and I believe that anyone who has heard the song can be used by savathun the same way shrieker are used by the hive, as eyes to be seen through. The perfect tool for the Hive God of deception.