def grab_genius(author, song, genius):
    """
    Grabs the lyrics from genius of a given song

    Parameters
    ----------
    author : String
        Name of the author
    song   : String
        Name of the song
    genius : Genius
        Genius access to API

    Returns
    -------
    String
        The lyrics of a song
    """
    # Search Genius for song
    song = genius.search_song(song, author)

    lyrics = song.lyrics.replace("\n", " ").split(" ")

    return lyrics if (song) else -1