( ∂ + m ) ψ = 0 

One of the bonds that has always triggered a certain curiosity in the human being is the affinity between physics and music.
In the past Music, physics and the cosmos were studied simultaneously with the intention of finding connections between them, as for example in the case of the study of the fundamental waves that make up the sound, that were first associated with the fundamental waves already present in the entire universe and related in turn to the first string theory; deducing that :
Both vibrations and resonances, being already present around Us and being part of the fundamental structure of the universe, from the smallest particle that composes a matter to those that will then form entire galaxies, would vibrate , just like violin strings or any other instrument, propagating in space/time.
If two systems interact with each other for a certain period of time, and then are separated from the universal laws, they can never be described as two separate systems, but as a single system. Just as it happens during musical composition. This is because, the two systems , first separated , once combined with each other will continue to influence each other , despite a possible aversion to each other.