A letra inclui o refrão e a estrofe.

Here, a letra means the lyrics of a song.

Portuguese uses letra for:

• letter of the alphabet
• lyrics of a song

So context is very important. In a music sentence like this one, a letra is understood as the song’s lyrics.

A very common longer version is:

• a letra da música = the lyrics of the song

That is just a difference between the two languages.

In Portuguese, it is very normal to use the singular:

• a letra = the lyrics

English prefers a plural-looking form:

• the lyrics

So even though the English translation is plural, the Portuguese noun is often singular when talking about one song’s lyric text as a whole.

Portuguese uses definite articles more often than English does.

In this sentence:

• a letra = the lyrics
• o refrão = the chorus/refrain
• a estrofe = the verse/stanza

Using the articles makes the sentence sound natural and complete in Portuguese. English often drops articles where Portuguese keeps them.

If you removed them, the sentence would usually sound less natural in normal conversation.

Inclui comes from the verb incluir = to include.

The subject is a letra, which is:

• third person
• singular

So the verb must also be third-person singular:

• a letra inclui

A few present-tense forms of incluir are:

• eu incluo = I include
• você/ele/ela inclui = you/he/she includes
• nós incluímos = we include
• eles/elas incluem = they include

It is the present indicative.

In a sentence like this, the present can describe:

• a general fact
• a description of something
• what is contained in something

So inclui here works like includes in English.

Because Portuguese nouns have grammatical gender.

• refrão is masculine → o refrão
• estrofe is feminine → a estrofe

This does not mean they are “male” or “female” in any real-world sense. It is just a grammar category, and the article has to match the noun.

They refer to different parts of a song.

• refrão = chorus or refrain
• estrofe = verse

A useful way to remember it:

• the refrão is the part that usually repeats
• the estrofe is one of the non-repeating sections between choruses

Also, estrofe can be used in poetry too, where it often means stanza.

Yes. That is grammatically correct.

Both versions are fine:

• A letra inclui o refrão e a estrofe.
• A letra inclui a estrofe e o refrão.

The difference is mainly emphasis or the order in which the speaker wants to present the items.

In a normal full sentence, it is more natural to keep them:

• A letra inclui o refrão e a estrofe.

Without the articles:

• A letra inclui refrão e estrofe.

This can sound more like:

• a heading
• notes
• a technical list
• a very compact style

For everyday standard Portuguese, the version with the articles is the safest and most natural.

Usually, yes. In music and poetry, estrofe is a common word for verse or stanza.

However, be careful with English verse, because in different contexts it can mean slightly different things. In song structure, estrofe is often the best choice. In poetry, it may be closer to stanza.

So in music, estrofe is a very good and common word to know.

Yes, very common.

In Brazil, people often say:

• a letra = the lyrics
• a letra da música = the lyrics of the song

If you are talking about more than one song, then plural is normal:

• as letras das músicas = the lyrics of the songs

So for one song, a letra is completely natural.