If you've retaken Felwinter Peak in Destiny: Rise of Iron, you may have noticed that tempting set of bells near the top of the Iron Temple. They're not just there for putting on concerts; ring them in the right order and you'll unlock the Sing the Iron Song achievement/trophy. Here's a video showing you how to do it.
With the big bell that stands alone being No. 1 and the rest being 2-6 from left to right, here's the order in which you'll need to ring them: 1-2-3-1-5-4-3-2-3-1. Bell No. 6 is unused for this particular melody, which happens to be the main theme for Rise of Iron. Station one player at Bell No. 1 and distribute as many players as you can recruit across the other four. It's possible to pull it off with two, but you'll need to be quick.
Playing the Rise of Iron theme for an achievement is a nifty little semi-secret, but I bet this set of bells is hiding more. Or perhaps it will after a future update. I doubt Bungie went to all this trouble just for one little achievement and the inevitable Carol of the Bells covers on YouTube.
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