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The Bloodied Horde states "All units in this Formation must begin the game in Deep Strike Reserve, even if the mission does not normally allow it. When making Reserve Rolls, make a single roll for the entire Formation, which you can choose to re-roll. On a successful Reserves Roll, all of the units in this Formation arrive from Reserve."

Instrument of Chaos states "When a unit with an instrument of Chaos in Deep Strike Reserve successfully passes its Reserve Roll, you can also choose another Unit. This unit must be entirely composed of models with the Daemon special rule, still in Deep Strike Reserve, and yet to make a Reserve Roll this turn. The chosen unit automatically arrives from Reserve (no roll is made)."

Can I use an Instrument to bring in the entire Bloodied Horde?

To clarify, I would be using a unit of Bloodletters with instruments not in the Bloodied Horde formation.

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No. The effect don't interact at all. The formation triggers all units coming in on a successful reserve roll. But the Instrument doesn't even roll for reserves you just pick a unit in reserve and deep strike it (it even specifies that it doesn't roll). Since the formation effect has to trigger of a successful roll the instrument will do nothing.

Well, not exactly nothing.

You can use the instrument to deepstrike a unit from the formation despite the fact the formation itself is not deepstriking.