Conclusion As we have already above mentioned, language as “the most important means of human intercourse” exists in the material form of speech sounds which cannot exist without being spoken such oral speech as the primary process of communication by means of language where written speech is secondary that represents what exists in oral speech. Phonetics as a science is a branch of linguistics. It is concerned with the study of the sound system of a language. Phonetics has a long history. It was known to the ancient Greeks and Hindus. But up to the 19th century it was considered to be a part of grammar. As an independent linguistic science it began to develop in Russia and Western Europe in the 2nd half of the 19th century.
The definition of phonetics as “the study of the sounds of a language” is not sufficient in modern linguistics. Nowadays phonetics is a science or branch of linguistics studying articulatory- acoustic features of a language. As a linguistic science phonetics is of great theoretical and practical value. Theoretically it is important to study the formation of speech sounds, their combinations, syllables, stress and intonation. There is close relationship between theoretical and practical phonetics, as it is important to combine theory and practice. It is impossible to represent a good pronunciation rule without a theoretical explanation of a particular question.
As an independent linguistic science phonetics has close connections with other disciplines linguistic branches as such grammar, lexicology and stylistics. It is connected with non- linguistic sciences such as biology, physiology, physics, and sociology and many others.
Literary stylistics and phonostylistics comprise the study of the aesthetic use of language (phonetic, prosodic and lexico-syntactic), both in texts that are predominantly aesthetic - canonical literature, oral narrative, jokes, etc. - and in texts with other predominant aims, e.g. conversation. Phonostylistics in particular contributes to the study of literary discourse and parallels the study of verbal texture in other discourse varieties. Phonostylistics mediates between the disciplines of linguistic and literary criticism, applying the methods and insights of linguistics to traditional problems in literary analysis, and the methods and insights of literary criticism to the analysis of language and intonation patterns.
The main orientations of phonostylistics are interdisciplinary, and toward literary studies in particular. Phonostylistics provides descriptive frameworks by which reader's hypotheses concerning the meanings and effects produced in texts can be explored through a systematic and principled attention to language and intonation patterns.
The stylistic approach to the utterance is not confined to its structure and sense. There is another thing to be taken into account which in a certain type of communication, e.g. belles-lettres, plays an important role. This is the way a word, a phrase or a sentence sounds.
Summarizing all above stated, now we can come to conclusion that the study of phonetics and discourse plays an immense role among linguistic sciences.