def METHOD_NAME(db_path, countries):
    """
    Method read all the original audio tracks and create a dict
            {<checksum>: <recording>}
    :param db_path: string, path to root of DAMP Sing!
    :return: dict
    """
    rec2chec = {}
    for country in countries:
        recordings = [
            f
            for f in listdir(join(db_path, country, country + "Vocals"))
            if f.endswith(".m4a")
        ]
        for record in recordings:
            rec2chec[
                hashlib.md5(
                    open(
                        join(db_path, country, country + "Vocals", record), "rb"
                    ).read()
                ).hexdigest()
            ] = record
    return rec2chec