定旋律（cantus firmus)是自古相传的曲调，常作为复调音乐（包括声乐、器乐）的构成素材。中世纪的素歌就是一种定旋律音乐。
尽管格什温兄弟创作的背景旋律主要是源于美国黑人音乐灵歌，蓝调和爵士，总经理威廉强调这部歌剧有一定的非洲根源。
Although the Gershwins’ score is American in its embrace of spirituals, blues and jazz, Mr Williams argues that the work has its roots in Africa.
随著悦耳的旋律、至诚的歌词、和他动人的歌声及演译，陈志杰带您踏上一个在神爱里的旅程。您定必得到鼓励与安慰。
With catchy melodies, heartfelt lyrics and his engaging voice and expressions, Anthony leads you to an intimate journey of love to God. You will be challenged and comforted.
其旋律、结构的形式和各定的方言土语联系紧密，他们是民歌体裁形式的基础，有的音调已构成了民歌的雏形。
Their rhythms, forms and structures are closely connected to dialects, and they are the original sources of the genre of folk song, for some of them are the embryonic form of folk songs.
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