Dario and his mother moved to their new apartment. The living room was large enough for their piano. That night they played rock music to celebrate. The loud music and laugh filled the room. 

The next morning they found a note under their door to complain(抱怨) about the sound of the piano. Dario's mother asked the building superintendent(管理员)about it. But he had no idea. Dario advised to write a letter to their neighbors(邻居) to apologize for it. 

"Maybe we could go and visit everyone face to face, " his mother said. "Why not invite them to come to our house for a party?"Dario asked.

They both loved the idea. Over the next few days, they sent out invitations and prepared for the party. On the day of the party, guests brought gifts. One woman, Mrs. Gilbert, gave Dario's mother a book of piano music by Chopin. 

"I heard you playing that night, " she said. "The sound woke me up. I worried that you might play like this every night, so I wrote a short note. " Dario's mother smiled at Mrs. Gilbert. "I'm sorry, I forgot the time when we were playing. Maybe we should play some quieter music at night. "

"I like your playing! Just not so loud at night. " Mrs. Gilbert said and pointed to the book she had given them. "These songs are better. "

"We will be happy to play them. " Dario's mother said. "And we won't play so loud or late!" Dario said. He was quite happy to see his mother's smile again.