Which vocal technique is emphasized in popular singing?

The emphasis on a flexible mouth shape in popular singing reflects the genre's focus on individual expression and stylistic versatility. This approach allows singers to explore a range of sounds and effects, making it easier to adapt their voice to different musical styles and emotional nuances. Popular music often incorporates elements of speech, improvisation, and personal interpretation, which can be achieved through a varied mouth shape that aids in producing different tones and articulations.

In contrast, the other options suggest techniques that are more aligned with classical or traditional approaches. Pure vowel tones and wide vibrato, for instance, are characteristics typically found in classical singing that prioritize clarity and sustained notes. Similarly, rigid adherence to traditional vocal forms and strict use of classical vocal techniques limit a singer’s ability to innovate and personalize their sound, which is crucial in the context of popular music where originality and emotional connection with the audience take precedence. The flexibility inherent in using varied mouth shapes supports the dynamic and diverse nature of popular vocal performance.