Table 3 Fixed structure of the 12 lyrics websites used as baselines

letras.mus.br

http://letras.mus.br/$song artist$/$song title$http://letras.mus.br/$song artist$/$song title$

vagalume.com.br

http://www.vagalume.com.br/$song artist$/$song title$.htmlhttp://www.vagalume.com.br/$song artist$/$song title$.html

http://moron.nl

http://www.moron.nl/lyrics/$song artist$/$song title$-lyrics.htmlhttp://www.moron.nl/lyrics/$song artist$/$song title$-lyrics.html

http://lyricsoncall.com

http://www.lyricsoncall.com/lyrics/$song artist$/$song title$-lyrics.htmlhttp://www.lyricsoncall.com/lyrics/$song artist$/$song title$-lyrics.html

http://lyricsreg.com

http://www.lyricsreg.com/lyrics/$song artist$/$song title$http://www.lyricsreg.com/lyrics/$song artist$/$song title$

vounessa.com.br

http://www.vounessa.com.br/musicas/$song title$http://www.vounessa.com.br/musicas/$song title$

http://6lyrics.com

http://www.6lyrics.com/$song artist$-lyrics-artista.aspxhttp://www.6lyrics.com/$song artist$-lyrics-artista.aspx

http://lyricshall.com

http://www.lyricshall.com/lyrics/$song artist$/$song title$http://www.lyricshall.com/lyrics/$song artist$/$song title$

http://lyricmania.com

http://www.lyricmania.com/$song artist$-$song title$-lyric.htmlhttp://www.lyricmania.com/$song artist$-$song title$-lyric.html

http://1songlyrics.com

http://www.1songlyrics.com/$first letter of song artist$/$song artist$/$song title$.htmlhttp://www.1songlyrics.com/$first letter of song artist$/$song artist$/$song title$.html

http://lyricspedia.com

http://www.lyricspedia.com/$song artist$/$song title$-lyrics/http://www.lyricspedia.com/$song artist$/$song title$-lyrics/

http://themusic-world.com

http://www.themusic-world.com/$song artist$/lyrics/$song title$http://www.themusic-world.com/$song artist$/lyrics/$song title$