Diction for Singers Diction, Phonetics, Vowel Chart, IPA Chart, Books, Resources at VOCALIST Phonetics as a research discipline has three main branches: Articulatory phonetics is concerned with the articulation of speech: The position, shape, and movement of. Search settings; Web History : Advanced search Language tools A Course in Phonetics (Sixth Edition) by Peter Ladefoged, Keith Johnson. Download A Course in Phonetics (Sixth Edition) A Course in Phonetics (Sixth Edition) Peter. The glottis is defined as the opening between the vocal folds (the rima glottidis)..