s: Sequence of :class:`FileType` implementations,
        defaults to all included ones.
    easy (bool):  If the easy wrappers should be returned if available.
        For example :class:`EasyMP3 <mp3.EasyMP3>` instead of
        :class:`MP3 <mp3.MP3>`.

Returns:
    FileType: A FileType instance for the detected type or `None` in case
        the type couldn't be determined.

Raises:
    MutagenError: in case the detected type fails to load the file.
Nr