def remove_credits(text):
    """Remove first/last line of text if it contains the word 'lyrics'
    eg 'Lyrics by songsdatabase.com'
    """
    textlines = text.split('\n')
    credits = None
    for i in (0, -1):
        if textlines and 'lyrics' in textlines[i].lower():
            credits = textlines.pop(i)
    if credits:
        text = '\n'.join(textlines)
    return text