Music is universally known as an art form and it is generally considered as a universal language as many people all over the world use it to express themselves and communicate.
Aside from being an art form, music is also a science and to those wondering how a guitar or piano can play specific notes in different octaves and pitches, it is all about sound, particularly soundwaves.
In the context of music, soundwaves have many fascinating properties and rules that vary depending on the musical instruments that produce them.
As musical instruments fall under string, wind, and brass instruments among others, these instruments create soundwaves that vibrate using air molecules as a medium. Soundwaves are longitudinal, which means they vibrate back and forth while the waves move all around the air.
These waves are classified as Standing Waves because they perform Reflection and Interference in the sense that a soundwave appears to be still while moving back and forth. The only thing that may change is there amplitude or volume.
Standing waves have different frequencies that match various musical notes. They contain areas in their vibrations that do not vibrate, which are called Nodes. They also have areas in their vibrations that do move, and the peak of their movements are known as Antinodes.
Generally, these instruments create music using the frequencies of standing waves, which depend heavily on the setup of these instruments. An example is if a guitar is tuned properly, its strings are tightly connected in both ends.
When plucked, this fixed connection will produce waves that travel through the string in a back and forth manner. This is how musical soundwaves work for stringed instruments and the dynamics vary depending if the instrument is string, wind, and brass in nature.
As complex as music composition is, musicians only have 12 notes to use in creating music.
In August 27, 1883, the volcanic island of Krakatoa in Indonesia erupted and produced a sound so loud that the shockwaves circled Earth four times.
Soundwaves travel through the eardrums, vibrating various tiny bones inside. This causes interaction with a cavity filled with fluid. The fluid stimulates tiny little hair follicles that send signals to the brain. This is how humans interpret sound.
Music stimulates just about every region of the human brain that includes the reward pathways that crave food. This is why babies tend to dance to music even without knowing what it is.