If you read my post on Straw Phonation, you learned that it is an "S.O.V.T." (semi-occluded vocal tract) exercise. The benefits of SOVT exercises are invaluable, and the Lip Trill is another excellent example. The benefits of Lip Trilling includes:
-increased vocal range
-legato singing
-vocal tension release
-smoothing out of vocal breaks/cracks
-balanced note production
-consistent and regulated airflow
-safe & effective way to warmup/cooldown without strain or fatigue
Check out my video below and let me show you how it's done!