sound to bring comfort

GE has a beautiful commercial that they aired recently. It depicts
images of women and babies from many cultures, with a woman's voice
singing "da da dum day dum day dum" over and over, to the sort of tune
one sings without even thinking when rocking a baby—a mother using
sound to bring comfort to her child.Since the commercial is by GE, and
it praises ultrasound, which uses "sound to bring comfort" to pregnant
women.

Other comforting sounds?
Listening in the hallway to your child breathing,
dad snoring on the couch,
steady beep of a heart monitor,
"The Lord is my shepherd",
"What's for supper, mom?",
"the peace of Christ with you",
"praise God from whom all blessings flow",
"hey, dear",
the click of the heater turning on fifteen minutes before the alarm goes off,
"And God said, it is good",
a group of men and women in the geriatric ward singing "this little
light of mine",
the beep of the coffee maker signaling that the coffee is ready,
"For my yoke is easy and my burden is light",
"Come, Lord Jesus"