Song Key  

In music theory, the concept of a song key refers to a collection of pitches or notes that serve as the foundation for a musical composition. A song primarily utilizes a particular scale  to find the song key. For instance, if a song exclusively incorporates notes from the C Major scale, it is commonly called "in the key of C Major."

Understanding the key to a song is essential for musicians. It provides a framework for comprehending the relationship between chords and notes in the composition. Knowing the song key helps create melodies and harmonies  and explore musical possibilities. Additionally, it facilitates the process of transposing the composition into different keys, enhancing the piece's versatility and adaptability.