6 Without time stamps, so cannot be used for LRC files
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8 - http://www.azlyrics.com
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10 - used by lyrico: https://github.com/abhimanyuPathania/lyrico/blob/master/lyrico/lyrico_sources/az_lyrics.py
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11 - http://www.darklyrics.com/
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13 - Heavy Metal texts only
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14 - used by rhythmbox: https://git.gnome.org/browse/rhythmbox/tree/plugins/lyrics/DarkLyricsParser.py
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15 - http://j-lyric.net
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18 - used by rhythmbox: https://git.gnome.org/browse/rhythmbox/tree/plugins/lyrics/JlyricParser.py
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19 - https://www.letras.mus.br/
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22 - used by rhythmbox: https://git.gnome.org/browse/rhythmbox/tree/plugins/lyrics/TerraParser.py
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23 - http://lyrics.jetmute.com/
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25 - formerly www.jetlyrics.com
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26 - used by rhythmbox: https://git.gnome.org/browse/rhythmbox/tree/plugins/lyrics/JetlyricsParser.py
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27 - http://lyrics.wikia.com/
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29 - used by lyrico: https://github.com/abhimanyuPathania/lyrico/blob/master/lyrico/lyrico_sources/lyric_wikia.py
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30 - https://www.musixmatch.com
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32 - used by lyrico: https://github.com/abhimanyuPathania/lyrico/blob/master/lyrico/lyrico_sources/musix_match.py