Translating a sentence

Translating a sentence
 

I am trying to translate the following sentence:

Ya les cantamos la de los “Liberales”; a ver, doña Julia, aquella de los mochos que dice de las Torres de Puebla.

I get -

Let's sing of the Liberals; I see, doña Julia, she who it is said is of the towers de Puebla.

Thank you in advance for helping me.

Steve

We already sang the one of the liberals, let's see doña Julia, the one from los mochos that talks about the towers of Puebla.