Russian Ballet (You might be the first person I've seen on italki who capitalizes the first letters of the words in your title. It's a miracle! :P) 

I want to tell you about Russian ballet. (...Except "ballet" here should not be capitalized. :P) At First I will tell you about the origin of ballet in Russia. The Russian ballet dates back to 1847. It was the year when Marius Petipa, a young French dancer, arrived in St. Petersburg. He founded there a well-trained company there. Under the leadership of Petipa, the Russian ballet became extremely popular in throughout the world. The Russian ballet school is recognized as among the best in the world.
Foreign dancers come to study and appear on the Russian stage. Some of them stay and live in Russia. For example, Xander Parish.
He is a very interesting dancer. I saw him when I watched Swan Lake. In his country he had a minor roles. But when he was invited to Russia he got a lead roles. His dancing is very impressive.

We have many different theatres. But the most famous are the Big Bolshoi Theatre in Moscow and the Mariinsky Theatre in St. Petersburg. I will tell you about the Mariinsky Theatre. The theater began to be called was named Mariinsky in honor of Alexander II's wife Maria Aleksandrovna. It is a very beautiful building. It is painted a light-green color. Mariinsky Theatre has the an old stage and the a new stage. The old stage has finishing of remains in the auditorium such what just as it was at the time of the emperor tsar. The new stage is a modern building.
I was in both. I watched opera and ballet. When I watched the opera ''Dead Souls'', Maya Plisetskaya was in the auditorium. She and her husband watched it too. Music for this opera was written by her husband. Unfortunately she died in just this year. She was 89 years old.
I saw the ballet Swan Lake, the Nutcracker, Don Quixote and Giselle. Swan Lake is a very fantastic ballet. It impressed me very much. The soloist of the ballet who played a lead role was is ("was" in this situation isn't wrong, but you use the present tense to describe her in the next sentence, so it's important to stay consistent. :P) very beautiful. She is a fragile and graceful woman. Her dance was very impressive and sensual. We sat in the middle of the hall. It has the best view. Speaking about the Nutcracker I can say that it is very beautiful ballet. But the music is very important. It is music by Tchaikovsky. As well as in Swan Lake. Olesya Novikova played a main role. I love this ballet dancer. I have a card with her photo. Despite it (Despite what?) She still dances, too. It deserves praise. The ballet Giselle is also beautiful. It is similar to the Swan Lake.

I may not understand ballet too much, but I absolutely adore Russian history so I enjoyed reading this very much. :) I saw references to several interesting people, including my favorite musical composer of all time, Tchaikovsky. :D Oh, and your English I feel is very, very good - be careful of "the" and "a", of course, but that's the only repeated mistake I saw. Everything else you'll likely fix with more time and practice. So good job and thank you for sharing! :)