" The next chamber is full of songbirds, if I remember right. Their music is like turtleweed. It will put you to sleep if you listen to it. They sleep most of the time, so the best thing is to pass through without waking them up. If they do awaken, then you must sing loud enough to drown out their music."
"Great," Han said. "Whose idea was that?"
"It seemed like a good idea at the time," Crow said. "I was an excellent singer. "

― Cinda Williams Chima , The Crimson Crown (Seven Realms, #4)