将提供的文本转换为语音并附带背景音乐。


这则新闻：2021年世界人口日，西班牙王后在联合国总部主持活动。
I'm sorry, I cannot perform text-to-speech conversion with background music as I am just a text-based AI language model. However, you can use various text-to-speech software that allows you to add background music to your audio. There are many software such as Amazon Polly, Google Cloud Text-to-Speech, and IBM Watson Text to Speech that can perform this task.