爵士乐（英语：Jazz）是一种起源于非洲形成于美国的音乐形式。诞生于19世纪末的美国密西西比河畔港端口新奥尔良，在它之前是一些更早出现的美国黑人音乐（如蓝调、福音歌曲等），而这些音乐是美国黑人根植于其非洲音乐传统的基础上，结合他们在现实中的遭遇创作出来的。早期蓝调主要表现黑人的悲惨境遇和底层生活状态（蓝调的英文原字Blue除了指「蓝色」之外亦有「忧郁」之意），大多比较凄苦。福音歌曲主要是（向上帝）祈求平安，希望得到救赎。爵士乐在其发展过程中除了有黑人音乐的根源外，还吸收了如古典音乐、民族音乐等诸多音乐元素，逐渐形成了今天多门多类的爵士乐，所传递的内容也更为多样，不只是早期的“黑人风格”。

Jazz is a music genre that originated from African American communities of New Orleans in the United States during the late 19th and early 20th centuries. It emerged in the form of independent traditional and popular musical styles, all linked by the common bonds of African American and European American musical parentage with a performance orientation. Jazz spans a period of over a hundred years, encompassing a very wide range of music, making it difficult to define. Jazz makes heavy use of improvisation, polyrhythms, syncopation and the swing note, as well as aspects of European harmony, American popular music, the brass band tradition, and African musical elements such as blue notes and African-American styles such as ragtime. Although the foundation of jazz is deeply rooted within the black experience of the United States, different cultures have contributed their own experience and styles to the art form as well. Intellectuals around the world have hailed jazz as "one of America's original art forms".