Diction is the way or style of pronouncing words. It embraces the manner of utterance of component parts as vowels, consonants, and syllables, and the relation of one word to another.
Good diction in singing means correct pronunciation, distinct and quick articulation, and right tone production. It requires that the breath be sufficient and well controlled and that the articulatory organs be highly flexible. Although it is necessary for singers to modify vowel sounds to a certain extent in order to produce pleasing tones, yet they should learn to do so in such a manner that sound will impress the hearer clearly. It should be a definite aim of the singer to render songs so that the words can be understood and yet not disturb the perfect and even production of sound. To do so is a test of artistry and is what is meant by 11 good diction."

Sometimes it is troublesome to pronounce some words in a song. For example, to sing a high note with a word which ends with a particular consonant may be difficult and to form it in the usual way may ruin the quality of tone. You can sometimes solve the problem if you sing the vowel and then practically speak the consonant. This requires that you stop the singing sound for a fraction of a second before you pronounce the consonant. To illustrate, if you have the word "boat" to sing on high a, sing boa then quietly say the t. boat boa - t Whereas it sometimes may be hard to produce a final consonant and still maintain right tonal quality, a consonant at the beginning of a word on a high tone usually helps place the tone. Pronounce it thoughtfully and place the consonant on the same level as the vowel.

An easily produced voice can help clumsy diction; good diction can improve voice placing.’ It is an interchangeable system. Sometimes by placing a tone a little more carefully, you find that a syllable which seemed difficult to pronounce can be handled more comfortably. Then again when a tone, usually a high one or a low one, seems hard to place, by pronouncing your syllable skillfully, the tone suddenly is placed.