When comparing complex psychological instruments like the General Health Questionnaire (GHQ-12) and the Rosenberg Self-Esteem Scale (RSES), Harmony provides an invaluable tool for researchers. The comparison and harmonisation process is streamlined using Harmony, making it possible to objectively evaluate matches between both sets of items in these instruments. The term GHQ 12 vs RSES suggests a comparison between two essential tools in psychology research, and Harmony makes this comparison efficient, easy, and effective. Harmony, with its natural language processing and generative AI models, is specifically designed to transform the complex task of harmonisation into a more straightforward process. Comparing GHQ 12 vs RSES is made significantly simpler through Harmony. Its large language models enable users to obtain a percentage match between each item in GHQ-12 and RSES, making the process of harmonisation less time-consuming and more accurate. Consistency across studies is critical for longitudinal and cohort studies, especially in the social sciences. By comparing GHQ 12 vs RSES using Harmony, researchers can ensure their results remain consistent, considering the changing social conditions. This not only adds credibility to the studies but also significantly streamlines the research process. Thus, Harmony is certainly a game-changer in psychology research.