"Dat du mien Leefsten büst" is known throughout Germany as a school song and is supposed to represent a typical North German or Friesian folksong. As a school song it has been bowdlerised in that verses 4 and 5 are expurgated. I suppose singing about sex before marriage even in this liberal and enlightened country is somewhat infra dig.
It has a lovely melody and a joy to sing. I have sung indeed many, many, many times. I used to love singing it with Kerstin Knie where we sang two-part with concertina accompaniment. I've also accompanied the Klingende Runde für jung und alt and the Idle Fellows with the penny whistle.
The Herminas also sang it beautifully on my very own CD namely Ditty Box.

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When with Das Trio it would be sung by Britta Steenken also accompanied her on my concertina..

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1. Dat du mien Leefsten büst, dat du woll weeßt
    Kumm bi de nacht, kumm bi nacht, segg wo du heest. (x2)

2. Kumm du um Middernacht, kumm du klock een!
    Vader slöppt, Moder slöppt, ik slaap alleen. (x2)

3. Klopp an de Kamerdöör, Faat an de Klink!
    Vader meent, Moder meent, dat deit de Wind. (x2)

4. Kummt denn de Morgenstund, kreit de ol Hahn.
    Leefster mien, Leefster mien, dann mößt du gahn. (x2)

5. Sachen den Gang henlank, lies mit de Klink!
    Vader meent, Moder meent, dat deit de Wind. (x2)