Аннотация:We investigated dependence of eye movement parameters on musical notation complexity and performance quality. 29 students of piano classes of Tchaikovsky Moscow State Conservatory and The Gnesins Russian Academy of Music were enrolled in the study. The participants were asked to sight-read three two-staves fragments of classical music works of different levels of complexity. Pianists were divided into two groups based on total score for all three fragments – medium score (MS) group and high score (HS) group. We assessed the the eye-hand span (EHS), the duration of gaze fixations (FD), number of fixations (NF), percentage of refixations after regressive saccades (RFP) and fixations on hands percentage (FHP). The value of EHS parameter significantly decreased as the background of increasing complexity of the musical fragment for FD the opposite pattern was observed. For other parameters, these dynamics were not revealed. Simple and complex musical fragments in the MS group lead to significantly more fixations than HS group...