Help me out here.

I did notice that part in Boss Baby. That sucked.

The other thing I noticed about Boss Baby is that the movie opened with a triangle pointing one direction and closed with a triangle pointing the other direction. 

Yeah, sure, no hidden meaning and its all for the kids.

Yes, a flute was used to activate the control room in Prometheus. David watched the Engineer do it in the hologram, then repeated the same notes to activate it himself.

Thanks Kethol. Which means that childish trolls really don't understand the whole flute scene

Correct.

Should we reveal the true reason of it or we will keep the secret? :)

That flute scene is important, it symbolizes cooperation, harmony, brotherly love, memory of Shaw.

Also this link states that flute is an instrument that symbolize God's voice. 

"In early cultures the flute played an important role in the realm of magic and was very closely linked to the hereafter and the spirit world with its gods. The instrument is often shown as being played by gods or symbolizes a god’s voice"

https://www.vsl.co.at/en/Concert_flute/Symbolism

So my own understanding is that David was trying to play the role of God. 

Jonesy - And it means something else regarding a possible AC sequel... Something important... :)

Yes, David is going to teach the colonists flute playing when they reach Origai 6 and create a massive flute orchestra.

Band camp!!!

They will play the recorders for the Engineers until they hit the brown note. Wait, that was a different show.