issue while converting the song to text file ...

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C#

speech

i have a code working for a smal sound wave but i have to convert a full lenght english song to text.... my code is only working with a short sound wave...i have written my code below ...what is wrong with this code and what are the changes i have to make in this code ...thanks

if(open.ShowDialog() == DialogResult.OK)
           {
             SpeechRecognitionEngine sre = new SpeechRecognitionEngine();
               Grammar gr = new DictationGrammar();
               sre.LoadGrammar(gr);
               sre.SetInputToWaveFile(open.FileName);
               sre.BabbleTimeout = new TimeSpan(Int32.MaxValue);
               sre.InitialSilenceTimeout = new TimeSpan(Int32.MaxValue);
               sre.EndSilenceTimeout = new TimeSpan(100000000);
               sre.EndSilenceTimeoutAmbiguous = new TimeSpan(100000000);

               StringBuilder sb = new StringBuilder();
               while (true)
               {
                   try
                   {
                       var recText = sre.Recognize();
                       if (recText == null)
                       {
                           break;
                       }

                       sb.Append(recText.Text);
                   }
                   catch (Exception ex)
                   {
                       //handle exception
                       //...

                       break;
                   }
               }
               richTextBox1.AppendText( sb.ToString());


           }