Which characteristic is commonly associated with Sarah Vaughan's singing?

Sarah Vaughan is renowned for her legendary vocal range and agility, which are defining characteristics of her singing style. She possessed a remarkable ability to navigate through diverse vocal registers seamlessly, allowing her to execute intricate melodies and complex improvisations with ease. Her expressive capability and dynamic control enabled her to convey deep emotion and nuance in her performances, making her one of the standout vocalists in jazz history.

Additionally, Vaughan's versatility allowed her to engage with various styles of music beyond jazz, demonstrating her proficiency in different genres such as pop and classical. This extraordinary combination of range and technical skill set her apart from many other vocalists and contributed to her lasting influence in jazz and popular music.