Debates may also be done while singing. Batangueños are known for the "duplo" (a sung debate where each lines of the verse must be octosyllabic) and the "karagatan" (a sung debate where each lines of the verse must be dodecasyllabic.) The latter, whose literal meaning is "ocean", got its name from the opening lines. Always, the karagatan is opened by saying some verses that alludes the depth of the sea and comparing it to the difficulty of joining the debate. And as mentioned above, the debate must be sung.