def get_composers(res):
    """
    Get the composers for the given track.

    **Parameters**

    - `res`:     string composer names for each track within charts

    **Returns**

    A dictionary of composers `{composer_num: composer_name}`.
    """
    if res != None:
        res = res.replace(", Jr", " Jr")
        composers = [
            name.strip()
            for first_split in res.split(", ")
            for name in first_split.split(" % ")
        ]
        return {f"composer_{i + 1}": name for i, name in enumerate(composers)}
    return {"composer_1": None}