The key word comes from the Latin "clavis" which is equivalent to key. A key is the set or group of symbols or characters that are used to broadcast, issue and transfer a message, whether secret or private. Or the set of numbers or letters that create a secret word that helps users to access a resource as such. An example of this is the internet where we can find many sites where they request the key, password or its equivalent in English password to be able to access an email or other service.
In music , the clef is understood as the sign that is placed at the beginning of the staff, and thus to be able to determine what position each note occupies, and the relationship that they have with the staff. For example, one of the most common is the treble clef; The function of a musical key is to locate the person who plays a certain melody within a tonality, for this the notes that are in harmonious relationship with each other are used. In Venezuela and Cuba, a harpsichord is a percussion musical instrument that consists of two wooden sticks of approximately 20 centimeters, which are struck against each other. And in the last mentioned country this word is also called to the person who plays this instrument.
In another context the term is used to refer to a person or thing that is fundamentally important or decisive to solve or clarify something. In the architectural field, this term is attributed to a stone that is used to close a vault or an arch.
