I forgot to mention that vagalume.com.br also has its own api: https://api.vagalume.com.br/

I would like to suggest the addition of two services that contain many songs in Portuguese. Unfortunately I'm not a developer and I can't make a PR to solve this, but I tried to gather some useful information.

Example 1: vagalume.com.br

Music: Tente outra vez
Artist: Raul Seixas

To get the lyrics of this song just access
https://www.vagalume.com.br/{artist}/{title}.html
https://www.vagalume.com.br/raul-seixas/tente-outra-vez.html

The cantata player has implemented this service as follows

<provider name="vagalume.com.br" charset="iso-8859-1" url="https://www.vagalume.com.br/{artist}/{title}.html">
    <urlFormat replace=" _@,;&amp;\/'&quot;." with="-"/>
    <extract>
      <item tag="&lt;span class=&quot;editable_area&quot;&gt;"/>
    </extract>
    <extract> <!-- new -->
      <item tag="&lt;div itemprop=description&gt;"/>
    </extract>
  </provider>

https://github.com/CDrummond/cantata/blob/master/context/lyrics_providers.xml#L328

It is also possible to get the translation of songs in English to Portuguese by adding -translation to the end of the url
https://www.vagalume.com.br/toto/i-will-remember-traducao.html

  <provider name="vagalume.com.br (PORTUGUESE)" charset="iso-8859-1" url="https://www.vagalume.com.br/{artist}/{title}-traducao.html">
    <urlFormat replace=" _@,;&amp;\/'&quot;." with="-"/>
    <extract>
      <item tag="&lt;div class=&quot;tab_traducao sideBySide lyricArea tab_tra_pt&quot;&gt;"/>
    </extract>
    <extract> <!-- new -->
      <item tag="&lt;div id=lyr_translation&gt;"/>
      <item begin="&lt;div&gt;" end="null"/>
    </extract>
  </provider>

https://github.com/CDrummond/cantata/blob/master/context/lyrics_providers.xml#L337

Example 2: letras.mus.br
The procedure is basically the same

https://www.letras.mus.br/winamp.php?musica={title}&artista={artist}
https://www.letras.mus.br/winamp.php?musica=tente-outra-vez&artista=raul-seixas

<provider name="letras.mus.br" charset="utf-8" url="https://www.letras.mus.br/winamp.php?musica={title}&amp;artista={artist}">
    <urlFormat replace="_@,;&amp;\/&quot;" with="_"/>
    <urlFormat replace=" " with="+"/>
    <extract> <!-- new -->
      <item begin="&lt;/div&gt;" end="&lt;div id=&quot;banner&quot;&gt;"/>
    </extract>
    <extract>
      <item begin="&lt;/div&gt;" end="&lt;/div&gt;"/>
    </extract>
    <invalidIndicator value="Verifique se o nome do seu arquivo e sua"/>
  </provider>

https://github.com/CDrummond/cantata/blob/master/context/lyrics_providers.xml#L101

I hope this will be useful