Literature is a branch of art. About society, literature is a mirror of life that can take advantage of the values that exist in society. This study aims to describe the Language Style in the Piano Novel in Agnes Jessica's Glass Box. The method in this research is descriptive qualitative. Qualitative research is carried out by not prioritizing numbers, but prioritizing the depth of appreciation of the interaction between the concepts being studied empirically in this novel, providing an understanding of course in analyzing literary works with the approach used is a pragmatic approach considering the implications of readers through their various competencies. By considering indicators of literary works and readers, the problems that can be solved through a pragmatic approach, including the various responses of certain communities to a literary work, either as an explicit or implicit reader, both in a synchronic and diachronic framework. The results showed that the language style in the novel Piano in the Glass Box by Agnes Jessica is very varied and creative. Agnes Jessicas' novel Piano in a Glass Box totals 377 pages. The total frequency of using Language Styles is 98 units. In this novel Piano di Kotak Kaca by Agnes Jessicain, there are four groups of language styles, namely comparative language styles, namely parable, metaphor, personification, and antithesis, contradictory language styles, namely hyperbole, litotes, irony, oxymoron, and zeugma.