I've been working on this one for a while now and I think I've tested it enough to finally confirm it. So remember the first phase of the VoG when you need to defend the sync plates? And after you complete it there's that little song that plays as the spire beam is opening the door? Well there are three different songs that can play there and I figured out what triggers each one. The first song will always play regardless of how you open the door as long as you are playing on normal difficulty. Here is a video of me playing through the sync plate phase on normal: https://www.youtube.com/watch?v=P3yH_tgOWqE The song is at 2:09. The second song will play on hard difficulty if you lose a sync plate during the phase. You'll know you've lost a plate when the message pops up saying, “The Vex are taking control of a Sync Plate”. Here is a video of me completing the phase this way, triggering the second completion song: https://www.youtube.com/watch?v=lY6tiigVF84 The song is at 4:48. It’s kinda hard to hear over the shotgun but I included some links to cleaner videos of each song at the end. The third and final song, the one that I believe is the “correct” song to play, will only play on hard difficulty if you complete the entire phase without losing a single sync plate. Here are a couple of videos of me triggering this song: https://www.youtube.com/watch?v=FGuMuVVoesc The song is at 3:21. I tested each song multiple times to make sure that that's what triggers each one and that they aren't just RNG. I don't know about you guys but this pretty much confirms for me that there is still some sort of secret left in the Vault of Glass. I would guess that the next trigger is somewhere in the Templar room since another song plays when you kill the Templar but I have no idea how to get it to change or if that's even what will change if that part of the raid is done correctly. The Templar song is the same whether he is killed on normal, hard, or with no teleports on either difficulty so maybe there is something that needs to be done during the conflux or oracle phases, or maybe there's a Templar trigger besides no teleports. Also, as a side note, one of the Cryptarch’s pieces of idle dialogue says, “Now what use would creatures like that have for music? No... It's language. Code, signal!”, so maybe the songs have some deeper meaning if we translate them somehow? Anyways this will hopefully get us on the right track and get more people interested in finding the secret. I think everyone should keep in mind when searching for secrets in the Vault that they might not find anything if they haven't done everything right up to that point. For reference here are videos containing just the songs. Normal mode: https://www.youtube.com/watch?v=_s-OVbGEcsE Hard mode, plates lost: https://www.youtube.com/watch?v=01TcirattH4 Hard mode, plates kept: https://www.youtube.com/watch?v=0w4DO34sI0s TL;DR: Doing the spire phase of VoG without losing any sync plates makes a different victory song play. Thoughts, theories, questions? Edit: I think I may have uploaded the wrong video for one of hard mode success songs. I'll check when I get home and upload the correct video. Edit 2: Yeah I definitely uploaded the wrong video for Hard mode plates kept. The video I uploaded is one of the normal mode videos I have so I'll change that as soon as I can. The Hard mode plates kept video that show the whole run is the right video however so if you want to hear the song and I haven't changed it yet just watch that one. Also I'll see if I have a cleaner video of the Hard mode plates lost song that doesn't have gunfire over it. Edit 3: Ok all the links should be to the right videos now. I fixed the hard mode, plates kept video and put in a different hard mode, plates lost video because the one I had was hard to hear. Edit 4: Wow this got a lot more attention than I thought it would. It seems like reddit is pretty interested in this kind of thing but usually my Vault posts only get a couple comments on the forums. Anyway thanks!