Singing through a straw is considered a semi-occluded vocal...
User Which_Set6331, in the MusicalTheatre subreddit,
Singing through a straw is considered a semi-occluded vocal tract (SOVT) exercise. “The theory behind the effectiveness of…
Phonation Threshold Pressure Measurement With a Semi-Occluded Vocal Tract
Overview of attention for article published in Journal of Speech, Language & Hearing Research, August 2009