From romance to reality: lexical and topic evolution in Chinese popular lyrics through digital humanities approaches

Abstract This study explores the lexical and topic evolution of Chinese popular music lyrics from 2000 to 2025, reflecting changing public sentiments and broader socio-cultural transitions. While prior research has largely overlooked non-Western lyric corpora, this study addresses that gap by constructing the Chinese Popular Music Diachronic Corpus, comprising 1,560 representative popular songs sampled across twenty-five years. Using digital humanities approaches, it integrates word frequency analysis, readability metrics, and BERTopic-based topic modelling to trace lexical and topic evolution of lyrics over time. Findings reveal that high-frequency words consistently revolve around emotional expression, individual introspection, and interpersonal dynamics. Type-token ratio (TTR) has increased significantly, indicating growing lexical diversity, while textual complexity shows fluctuation, reflecting stylistic shifts in song writing. Topic analysis identifies twelve major topics, including romantic love, future aspirations, and urban life, with topic structures evolving from natural and temporal abstraction to emotional concreteness and psychological introspection. Recent years show a significant rise in negative emotional topics and self-referential artistic motifs. This study contributes a novel methodological framework for interdisciplinary research at the intersection of music, language, and society, and underscores the value of digital humanities tools in mapping collective emotions and cultural change through large-scale lyric analysis.