/// <summary>
/// Get a 30s preview of a media
/// </summary>
/// <param name="client">An IXboxMusicClient instance to extend</param>
/// <param name="id">Id of the media to be streamed</param>
/// <param name="country">ISO 2 letter code.</param>
/// <returns>Stream response containing the url, expiration date and content type</returns>
static public Task <StreamResponse> PreviewAsync(this IXboxMusicClient client, string id, string country = null)
{
return(client.PreviewAsync(id, ClientInstanceId, country));
}
