What happened to the work after that first performance is an interesting story. Tchaikovsky himself had not been at the first performance because he was in Switzerland trying to calm himself down after a very short, disastrous marriage. He wanted to prepare the work so that it could be published. He sent Fitzhagen a short score (this is similar to an arrangement for the piano). He asked Fitzhagen to make any necessary changes to the cello part. Meanwhile, Tchaikovsky got on with the job of orchestrating the music (showing exactly what is played by each instrument).