When a movement is repeated several times, subtle differences can be observed between repetitions. In sports biomechanics, studying intra-individual movement variability and its implications has the potential to prevent injuries, assess treatment progress, and inform the development of research protocols ( Preatoni et al. 2013). While researchers in the field of music share many of these goals, little attention has been paid to intra-individual movement variability. This scoping review aims to consolidate the existing evidence regarding the intra-individual movement variability of piano performance, to shine light on three significant methodological issues: a) what methods have been used to measure this intra-individual movement variability; b) what is the influence of expertise on this intra-individual movement variability and c) how many trials should be used in a research design in order to obtain a reliable assessment of piano performance. Additionally, gaps in our understanding of the phenomenon are identified and recommendations for future research are issued.