From Destinypedia, the Destiny wiki
Start Location: The Rupture
The player activates the adventure and moves towards the objective
The player enters a tunnel system and continues into a cave where the source of the music is discovered to be originating from a mysterious black diamond floating in the middle of the room. It is emitting orange particles akin to SIVA nannites, a bright light, and the music. A group of Vex are in the cave, staring intently at the object, scanning it.
The player kills the Vex and examines the object.
The player transits towards the next location, Giants Scar.
The player enters the area, moving through the base towards the back of the area, past the Cabal drill. As the player approaches the back, more music can be heard, this time distinctly classical, and more Vex units spawn in. Those units closest to or inside the cave where the next drone is are covered with electricity and appear to be taking damage from the object.
The player defeats the Vex and scans the object
The player continues on into Terrabase Charon, where more music is heard. The player defeats still more Vex guarding a cave with yet another object inside. This is the same cave where Ghost Scan NE-TBC-2 is located:
The Vex inside the cave listening to the music are dormant and non aggressive.
The player scans the object.
The player moves to the next location, Warmind Vault JYS-2, which opens its doors in invitation as the player arrives.
The player enters the vault and moves towards the sound of music in the foyer corridor outside the core processing room.
As the player approaches the Vex, several more of the mysterious objects spawn in, electrocuting the Vex units nearby, revealing the items to be defensive proxies in which their music acts as a lure to bring enemies within damage ranges.
The player defeats the Vex.
The player examines a closed hatch between them and the music, which upon opening reveals a storage facility containing hundreds of the defensive drones. An active drone is floating in the air immediately in front of the player, causing a musical except from Tchaikovsky's 6th Symphony to be played while the screen flashes with red.
Something then happens to Ghost.