Despite being banned in favor of monophony (Russian: единогласие, romanized: edinoglasiye, lit.
[vague] The tradition of polyphony arose in the early 16th century, when chants transformed from being performed recitatively to being elaborately sung.
At the same time, the strict service regimen adopted in monasteries had become the norm in ordinary churches.
[2] As a result the full church service had gradually become extremely long.
The Stoglavy Sobor had forbidden polyphony in the mid-16th century, but it continued for some time after the proscription.