One of the fundamentals of singing is understanding that while imagination is vital, it is deeply dependent upon the physical functionality of the voice. Our imagination encompasses tonal colors, feelings, rhythm, and volume—all the ingredients needed to express what is in the heart. However, if vocal function is impaired, our expressive capacity is naturally limited.
For example, if a singer can only access their "chest voice," they may be able to push the voice upward with volume, but the unique textures created by the "falsetto" muscles remain physically unimaginable. While they might intellectually understand these sounds by hearing others, the sounds are not yet "real" within their own body.
Therefore, the primary goal of vocal training is to improve function. As your physical range of sounds expands, your imagination soars. By unlocking new muscular coordinations, you gain the ability to express your "heart song" with a richness and variety that was previously impossible.