Dạ cổ hoài lang

Dạ cổ hoài lang (Vietnamese: [zâːˀ ko᷉ hwâːj laːŋ], "Night Drum Beats Causes Longing for Absent Husband") is a Vietnamese song, composed 1919 by songwriter Cao Văn Lầu, colloquially known as "ông Sáu Lầu," from Bạc Liêu. It was a massive hit across Vietnam in 1927 as it was taken up by travelling troupes and spawned many variants, versions and imitators.

The song "Dạ cổ hoài lang" was the first song in what became known as the defining vọng cổ ("longing") melody of the nhạc tài tử ("amateur music") genre of cai luong ("reformed") music that for many people ông Sáu Lầu's "Dạ cổ hoài lang" is vọng cổ.

The first verse of the original core song is:

This is usually preceded and interspersed by recitative, this is the beginning of the tân cổ version from folk singer (1924)

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