This page contains Portal 2 Hints for PC - Windows called "Singing turrets" and has been posted or updated on Apr 26, 2011 by LilMissKatrina. Let us know what you think of this Hint by thumbs voting.
There is a turret inside a ventilation grate just past the elevator in Test Chamber 16. Jump over it, get the Refraction Cube, then use the laser to destroy that turret to open the grate. Enter the new area to find four turrets singing a song.
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