na_values = [
    '-1.#IND',
    '1.#QNAN',
    '1.#IND',
    '-1.#QNAN',
    '#N/A N/A',
    '#N/A',
    # 'N/A',  # REMOVED DUE TO CONFLICT WITH MISSING SONGWRITERS
    # 'n/a',  # REMOVED DUE TO CONFLICT WITH MISSING SONGWRITERS
    'NA',
    '<NA>',
    '#NA',
    'NULL',
    'null',
    'NaN',
    '-NaN',
    'nan',
    '-nan',
    ''
]