One evening, the little chandelier in the mouse hole began to shake. Justina knew that Chopin was entertaining his friends in the parlor. She instructed Pianomouse to attend the concert with the other guests. Pianomouse assured his mother that he would not be caught, and he headed toward the parlor. While scurrying not to miss one note, he happened to come upon the most beautiful banquet table full of pastries, bread and cheese. Pianomouse decided to not only enjoy the beautiful music, but to also sample the delicious sweets. He stuffed his pockets with bread and cheese and gathered a few desserts. He then headed towards the music in the parlor. While balancing teacakes and a wedge of cheese, Pianomouse scrambled up the side of the piano. Suddenly, he lost his balance and fell right inside the piano. When Chopin hit a high note, the lid came crashing down. He was now trapped inside Chopin's piano. The music continued, echoing in his ears. Pianomouse began jumping madly to avoid being struck by the piano hammers. As the evening went on, Pianomouse grew weary running from the hammers. But just when Pianomouse was about to give up, the candles were snuffed out and Chopin was bidding farewell to his friends. Chopin headed for bed after an evening of music and merriment. The room became silent and dark. With one loud squeak, Pianomouse alerted his parents for help. Nicholas and Justina scurried up the side of the piano and discovered the dilemma Pianomouse had gotten himself into. They helped wedge him out and then safely returned to their snug little mouse hole. With a tummy full of sweets and music in his ears, Pianomouse was tucked in bed for the night.

The next morning his mother scolded him for being mischievous. "How are you ever going to learn music if you do not stop eating Chopin's pastries and cheese?" With that, Pianomouse sat down at his little piano and began practicing his scales and chords. From that day forward, he practiced everyday, and always with a little mouse smile.

One day, a visitor arrived at the mouse hole. Friedrich, a friend of Nicholas and Justina, came to visit with his daughter, Clara. Pianomouse was introduced to Clara and from that day forward they became best friends. They both loved music. Pianomouse would play his little piano, while Clara would play her beloved violin. Together they spent many hours laughing, playing music, and eating cheese.

As they grew older, they decided to attend Mousetro Conservatory of Music. At the conservatory, Pianomouse studied under the great Leonardo Micestein while Clara studied with the famous Dr.Mary Costa. Soon enough, Clara was touring throughout Europe as a concert violinist. Her fame was growing and her dream was to someday perform at Carnegie Hall.

Pianomouse pursued his career in music performing throughout all of the great concert halls of Europe. He loved to play the music of Chopin. As his fame grew, so did his fortune. Pianomouse loved his music and loved performing.

Meanwhile, another great performer had entered the European stage, the great Puccini, the opera-singing cat. Puccini was born in Milan, Italy. His parents, Antonio and Maria were famous opera-singing cats. When Puccini was very little, he loved to sing. He would wake up singing and sing all day until he fell asleep at night. Antonio and Maria knew that Puccini would someday sing at La Scala, the famous opera house in Milan. When Puccini was little, he was mischievous. During his singing class, he would often tease his teacher by intentionally singing wrong notes. As Puccini grew older his voice became even more beautiful.

The day finally arrived when he was invited to sing at La Scala. The curtain rose and there on stage stood Puccini, the most magnificent opera-singing cat. He sang for hours until the audience cheered wildly. "Bravo! Bravo!" the audience screamed. Puccini had the most beautiful voice they had ever heard.

Since that night at La Scala, Puccini thought of himself as the toast of Italy. One evening he was gathered with his friends, when he heard about another famous performer, Pianomouse. "Who is this Pianomouse?" shouted Puccini. "I must find out if he is more famous than me?" Ever since then, Puccini has been looking everywhere for Pianomouse. He sets trap and tries to trick him. He has not caught Pianomouse yet, but he is following his Mouse Tracks!