def describe_voices(LanguageCode=None, NextToken=None):
    """
    Returns the list of voices that are available for use when requesting speech synthesis. Each voice speaks a specified language, is either male or female, and is identified by an ID, which is the ASCII version of the voice name.
    When synthesizing speech ( SynthesizeSpeech ), you provide the voice ID for the voice you want from the list of voices returned by DescribeVoices .
    For example, you want your news reader application to read news in a specific language, but giving a user the option to choose the voice. Using the DescribeVoices operation you can provide the user with a list of available voices to select from.
    You can optionally specify a language code to filter the available voices. For example, if you specify en-US , the operation returns a list of all available US English voices.
    This operation requires permissions to perform the polly:DescribeVoices action.
    See also: AWS API Documentation
    
    Examples
    Returns the list of voices that are available for use when requesting speech synthesis. Displayed languages are those within the specified language code. If no language code is specified, voices for all available languages are displayed.
    Expected Output:
    
    :example: response = client.describe_voices(
        LanguageCode='cy-GB'|'da-DK'|'de-DE'|'en-AU'|'en-GB'|'en-GB-WLS'|'en-IN'|'en-US'|'es-ES'|'es-US'|'fr-CA'|'fr-FR'|'is-IS'|'it-IT'|'ja-JP'|'nb-NO'|'nl-NL'|'pl-PL'|'pt-BR'|'pt-PT'|'ro-RO'|'ru-RU'|'sv-SE'|'tr-TR',
        NextToken='string'
    )
    
    
    :type LanguageCode: string
    :param LanguageCode: The language identification tag (ISO 639 code for the language name-ISO 3166 country code) for filtering the list of voices returned. If you don't specify this optional parameter, all available voices are returned.

    :type NextToken: string
    :param NextToken: An opaque pagination token returned from the previous DescribeVoices operation. If present, this indicates where to continue the listing.

    :rtype: dict
    :return: {
        'Voices': [
            {
                'Gender': 'Female'|'Male',
                'Id': 'Geraint'|'Gwyneth'|'Mads'|'Naja'|'Hans'|'Marlene'|'Nicole'|'Russell'|'Amy'|'Brian'|'Emma'|'Raveena'|'Ivy'|'Joanna'|'Joey'|'Justin'|'Kendra'|'Kimberly'|'Salli'|'Conchita'|'Enrique'|'Miguel'|'Penelope'|'Chantal'|'Celine'|'Mathieu'|'Dora'|'Karl'|'Carla'|'Giorgio'|'Mizuki'|'Liv'|'Lotte'|'Ruben'|'Ewa'|'Jacek'|'Jan'|'Maja'|'Ricardo'|'Vitoria'|'Cristiano'|'Ines'|'Carmen'|'Maxim'|'Tatyana'|'Astrid'|'Filiz'|'Vicki',
                'LanguageCode': 'cy-GB'|'da-DK'|'de-DE'|'en-AU'|'en-GB'|'en-GB-WLS'|'en-IN'|'en-US'|'es-ES'|'es-US'|'fr-CA'|'fr-FR'|'is-IS'|'it-IT'|'ja-JP'|'nb-NO'|'nl-NL'|'pl-PL'|'pt-BR'|'pt-PT'|'ro-RO'|'ru-RU'|'sv-SE'|'tr-TR',
                'LanguageName': 'string',
                'Name': 'string'
            },
        ],
        'NextToken': 'string'
    }
    
    
    """
    pass
