The oldest written fragments of Siwu found so far come from Rudolph Plehn (1898). ¹ Besides some words and phrases (edited and published in 1899 by his friend Seidel), Plehn took down two lines of songs. To one of them I devoted a post some time ago.

Funeral dirges ( sìnɔ in Siwu) are sung during the period of public mourning preceding a burial. The musical structures of these dirges, the performances, and their place in the larger context of the funeral have been described in some detail by Agawu (1988) and before him by the German missionary Friedrich Kruse (1911); however, the linguistic aspects of the genre have not received any attention so far.

Having been a small and quite isolated language for centuries, Siwu was relatively late to attract attention from outsiders. Europeans in search for gold to buy and people to enslave for the most part stayed near the coast.