FEATURES OF THE PROFESSIONAL ACTIVITY OF THE PIANISTCONCERTMASTER (ON THE EXAMPLE OF KAZAKHSTAN) - Mussapirova Z. T., Kanapyanova G, Bultbayeva A. Z., Sultangaliyeva E. S., Amirova D. Z., Shabdenova D. R., Begembetova G. Z., Bykovskikh D. I (PalArch’s Journal of Archaeology of Egypt / Egyptology, 2020)