Pierwsze próby reform śpiewu cerkiewnego na Rusi. Działalność I i II Komisji (1652-1670)

The article raises the issues of the first attempts of the Orthodox church music reforms in Ruthenia, which were undertaken between 1652-1670 on the orders of tsar Alexei Mikhailovich. The author starts with the detailed description of key liturgical problems of the Orthodox Church in Moscovia at that time. The second part of this article constitutes the analysisof the I and II Commission’s activities as well as evaluation of Alexander Miezieniec ‘work – one of the Commission coordinators. There are also described problems which reformers came across, e.g. the absence of uniform comparative material such as liturgical books with musical notation.