So you have cartilage in your knees, right? You need that connective tissue for support when you walk. You also have cartilage in your larynx that supports your singing. The larynx cartilages form distinctively different shapes when singing in different modes. Complete Vocal Institute has mapped the patterns of these shapes, given them names (called ‘vocal modes’) and published a peer reviewed scientific paper on two of these modes, Overdrive and Edge:
Overdrive and Edge as Refiners of Belting
Belting has been a much argued term in voice teaching, where sometimes singers are singing loud and shouty, sometimes sharp, sometimes quiet. Complete Vocal Institute shows us that these sounds are different settings of the vocal tract. The larynx cartilage (along with other helpful larynx tissues) have different shapely settings!