The Troparia turn to the strophes of the Hirmos, as to a model.
There are always two concerned, who alternately sing the strophes.
It is divided into five strophes, three of which are marked by Selah.
One or two of the strophes are worth quoting, just to show what the lay is like.
In the poem as adapted for music they alternate in sixteen strophes and antistrophes.