We’d like to share this great article with everyone. Straw phonation is used to improve the efficiency of the vocal mechanism, balance the alignment of the vocal folds, and reduce vocal fatigue while improving the quality of the voice.
http://www.voicescienceworks.org/straw-phonation.html
Here are some additional videos on the subject we think you’ll find helpful.
1. Instructional video by a master voice scientist/vocologist, Ingo Titze: Vocal Straw Exercise
2. The Science Behind the Straw Exercise: Video 1
3. The Science Behind the Straw Exercise: Video 2
4.The Science Behind the Straw Exercise: Video 3