Azure text to speech LINQPad

Azure Speech Service.linq

<Query Kind="Program">
  <Output>DataGrids</Output>
  <Reference>&lt;RuntimeDirectory&gt;\System.Net.Http.dll</Reference>
  <NuGetReference>Microsoft.CognitiveServices.Speech</NuGetReference>
  <NuGetReference>NAudio</NuGetReference>
  <NuGetReference>NAudio.Lame</NuGetReference>
  <Namespace>Microsoft.CognitiveServices.Speech</Namespace>
  <Namespace>NAudio.Wave</Namespace>
  <Namespace>System.Net.Http</Namespace>
  <Namespace>System.Net.Http.Headers</Namespace>
  <Namespace>System.Threading.Tasks</Namespace>
</Query>

async Task Main()
{
	string token = await CreateToken(MyExtensions.RecognizeSubscriptionKey);
	var text = @"床前明月光，疑是地上霜。举头望明月，低头思故乡。";
	
	await PlayMp3Stream(await ConvertTextToStream(token, text, "zh-CN", "Male", "Microsoft Server Speech Text to Speech Voice (zh-CN, Kangkang, Apollo)"));
	await PlayMp3Stream(await ConvertTextToStream(token, text, "zh-CN", "Female", "Microsoft Server Speech Text to Speech Voice (zh-CN, Yaoyao, Apollo)"));
	await PlayMp3Stream(await ConvertTextToStream(token, text, "zh-CN", "Female", "Microsoft Server Speech Text to Speech Voice (zh-CN, HuihuiRUS)"));
}

HttpClient client = new HttpClient();

async Task<string> CreateToken(string subscriptionKey)
{
	var request = new HttpRequestMessage(HttpMethod.Post, "https://api.cognitive.microsoft.com/sts/v1.0/issueToken");
	request.Headers.Add("Ocp-Apim-Subscription-Key", subscriptionKey);
	var response = await client.SendAsync(request);
	var token = await response.Content.ReadAsStringAsync();
	return token;
}

async Task<Stream> ConvertTextToStream(string token, string text, 
	string locale = "zh-CN", 
	string gender = "Male", 
	string name = "Microsoft Server Speech Text to Speech Voice (zh-CN, Kangkang, Apollo)")
{
	var request = new HttpRequestMessage(HttpMethod.Post, "https://speech.platform.bing.com/synthesize");
	request.Headers.TryAddWithoutValidation("Content-Type", "application/ssml+xml");
	request.Headers.Add("X-Microsoft-OutputFormat", "audio-16khz-128kbitrate-mono-mp3");
	request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
	request.Headers.Add("X-Search-AppId", "20c69425fac84a3ababd5f3400eb011f");
	request.Headers.Add("X-Search-ClientId", "bfb326e629aa44659a69a23389aea581");
	request.Headers.UserAgent.ParseAdd("LINQPad");
	request.Content = new StringContent(new XDocument(
	                      new XElement("speak",
							  new XAttribute("version", "1.0"),
							  new XAttribute(XNamespace.Xml + "lang", "en-US"),
							  new XElement("voice",
								  new XAttribute(XNamespace.Xml + "lang", locale),
								  new XAttribute(XNamespace.Xml + "gender", gender),
								  new XAttribute("name", name), text)))
						  .ToString());
	var response = await client.SendAsync(request);
	response.EnsureSuccessStatusCode();
	var stream = await response.Content.ReadAsStreamAsync();
	return stream;
}

async Task PlayMp3Stream(Stream stream)
{
	var device = new WaveOut();
	device.Init(new Mp3FileReader(stream));
	device.Play();
	while (device.PlaybackState == PlaybackState.Playing)
	{
		await Task.Delay(100);
	}
}