KNOWN_DIRECTIVES = [
    ('title', 't'),
    ('subtitle', 'st'),
    ('artist',),
    ('composer',),
    ('lyricist',),
    ('arranger',),
    ('copyright',),
    ('album',),
    ('year',),
    ('key',),
    ('time',),
    ('tempo',),
    ('duration',),
    ('capo',),
    ('meta',)
]
KNOWN_VERSE_TYPES = [
    'verse',
    'chorus',
    'bridge',
    'tab',
    'grid'
]
ENGLISH_NOTES = '[CDEFGAB]'
GERMAN_NOTES = '[CDEFGAH]'
NEOLATIN_NOTES = '(Do|Re|Mi|Fa|Sol|La|Si)'
CHORD_SUFFIXES = '(b|bb)?(#)?(m|maj7|maj|min7|min|sus)?(1|2|3|4|5|6|7|8|9)?'
SLIM_CHARS = 'fiíIÍjlĺľrtť.,;/ ()|"\'!:\\'