Which vocal technique involves blending different tones and pitches smoothly?

The vocal technique that involves blending different tones and pitches smoothly is legato. This technique is characterized by producing notes in a connected manner, allowing for a seamless transition from one pitch to another without noticeable breaks or interruptions. In legato singing, each note flows into the next, creating a smooth and flowing sound that is essential for conveying emotion in music. This technique is often used in classical singing but can also be applied in various music genres to enhance expressiveness.

While staccato refers to singing or playing notes in a sharp, detached manner, and vibrato involves a regular, pulsating change of pitch that adds warmth and expression to a tone, these techniques do not focus on the smooth blending of pitches. Chiaroscuro, which relates to a balance of light and dark tones, is more relevant in the context of timbre rather than smoothness in pitch transitions. Thus, legato stands out as the technique specifically aimed at creating a continuous and connected flow of sound.