Recordings of "whale songs" - the sounds made by whales to communicate under the sea over hundreds of miles - are used by many people for relaxation purposes. Also, the sound of surf (waves breaking on the shore) is frequently used in relaxation recordings. The rhythm of the waves breaking and then the sound of the water being pulled back out to sea over sand or shingle is very relaxing and soporific.
The suggestion is that this idiotic child, having been told off, needs to just chill out!
Student or Learner