Which of the following characteristics defines classical singing?

The defining characteristic of classical singing is the rich, wide vibrato combined with clear consonants. This style is rooted in a long tradition that emphasizes vocal health, control, and the ability to project the voice without the aid of microphones. Vibrato contributes to the warmth and richness of the tone, allowing for a more expressive delivery of the music. Clear consonants are essential in classical singing because they ensure that the lyrics are understandable and impactful, allowing the emotional content of the piece to be communicated effectively.

In contrast, the other options reflect different styles or less formal techniques. While less vibrato may be a feature in certain contemporary styles, it does not align with the classic technique that relies on fullness of sound. Casual vocal techniques and varied sounds suggest a more informal approach, which may be present in popular or folk singing rather than the structured nature of classical. Similarly, the emphasis on rhythmic and melodic improvisation is typically associated with jazz or other genres rather than the classical tradition, which values adherence to the written score and stylistic conventions. Hence, the combination of a rich vibrato with clear enunciation epitomizes the essence of classical singing.