Variety the Spice of Art
"It can hardly be questioned that the genesis of all musical art is to be found in song, the most natural, the most fluent and the most beautiful form of musical expression. How much every instrumentalist can learn from the art of singing!
"It is a physical impossibility for the voice to produce two notes in succession exactly alike. They may sound very similar, but there is a difference quite perceptible to the highly trained ear. When a singer starts a phrase a certain amount of motive power is required to set the vocal apparatus in vibration. After the first note has been attacked with the full force of the breath, there is naturally not so much weight or pressure left for the following notes. It is, however, possible for the second note to be as loud, or even louder, than the first note. But in order to obtain the additional force on the second note, it is necessary to compensate for the lack of force due to the loss of the original weight or pressure by increasing what might be called the nervous energy; that is to say, by expelling the breath with proportionately greater speed.