In 1666 Dutch physicist Christian Huygens, the inventor of the pendulum clock noticed that the pendulums of 2 clocks mounted on the same wall had synchronised! This was the birth of the term “entrainment”.

“Entrainment involves the ability of the more powerful rhythmic vibrations of one object to change the less powerful rhythmic vibrations of another object and cause them to synchronise their rhythms with the first object. Through sound it is possible to change the rhythms of our brainwaves, as well as our heart beat and respiration.” 

Jonathon Goldman, Resonant Sounds

Examples of Entrainment: