Cathedral of our Lady of Kasan

On the last day I wanted to go and hear some singing in a church so took the bus down Nevskiy Prospekt for what was advertised as a time of worship.  This cathedral built in 1811 was inspired by St Peter's Basilica in Rome. It was used as a museum of atheism during the Soviet period but religious services made a return in 1992.
Actually what was going on was some type of marriage ceremony with accompanying singers from a gallery at the back of the church. There was chanting and then crowns placed over the heads of the couple taking part in the ceremony. What was not quite understandable was they seemed to have three children in attendance, an infant and two children of about four and six. Anyhow it was quite a spiritual occasion.