人们对掌握各种力度的理论的探讨不如歌唱的其他方面充分,这可能是由于声音的强弱和洪亮程度与呼吸、发音和共鸣有紧密关系。美国声乐教师学会对音量下定义时,再次肯定了一个已得到人们普遍认可的理论:“呼吸控制是提高音量的过程中一个密不可分的部分,因为它需要更大的气息压力来对抗声带的阻力。” There is less discussion of the theory of mastery of force than the other aspects of singing, probably because the intensity and loudness of sound are closely related to breathing, pronunciation and resonance. The American Society of Vocal Teachers reaffirms a widely accepted theory when it comes to defining volume: “Breathing control is an integral part of raising volume because it takes more stressful pressure to resist vocal cords resistance.”