Jazz had to keep up to date. Over the last half century it has changed many times in form, style, and tempo. Each change added something new.

• 爵士乐必须跟上时代的步伐。在过去的半个多世纪里，它已在形式、风格和速度上经历过多次变化，每次变化均加进了一些新的东西。