Form and return a music service item uri

    Args:
        item_id (str): The item id
        service (MusicService): The music service that the item originates from
        is_track (bool): Whether the item_id is from a track or not

    Returns:
        str: The music service item uri

def form_uri(item_id, service, is_track):
    """Form and return a music service item uri

    Args:
        item_id (str): The item id
        service (MusicService): The music service that the item originates from
        is_track (bool): Whether the item_id is from a track or not

    Returns:
        str: The music service item uri
    """
    if is_track:
        uri = service.sonos_uri_from_id(item_id)
    else:
        uri = 'x-rincon-cpcontainer:' + item_id
    return uri