Portuguese, just like any other language, is composed of elementary sound components called phonemes. These phonemes combine to create syllables. The syllables combine in rhythmic sequences to create speech. In Rhythmic Phonetic Training (RPT), you learn each separate syllable of a song then practice articulating them in their correct rhythmic sequences.
Before using RPT to learn Portuguese songs, however, you must first familiarize yourself with the Portugese phonemes. In The Portuguese Sound System Primer (which you will study after finishing this RPT primer), you learn how to distinguish and articulate each of the Portuguese phonemes.
It is vital that you complete the entire Sound System Primer, since your comfort with normal Portuguese speech relies on your comfort with its basic components, i.e. the Portuguese phonemes.