How to play different audio files on a single page

I would like to play different short audio clips on a single page by using different buttons, however the code I have means that all buttons will play only the first .mp3 located in the audio folder regardless of the html code I have that specifies which button will play which audio clip (example below).

Could you help me with the code to figure out where I went wrong?

Thanks!

<tr>
   <td><strong>Welcome!</strong></td>
   <td><a><input type="button" value="▶" onclick="play()">
   <audio id="audio" src="http://www.noiseaddicts.com/samples_1w72b820/3740.mp3"></audio></a>Diluedinpe! 
    </td>
 </tr>

  <tr>
    <td><strong>Good Evening</strong></td>
    <td><input type="button" value="▶" onclick="play()">
    <audio id="audio" src="http://www.noiseaddicts.com/samples_1w72b820/3719.mp3"></audio>Butuku bulenaga</td>
  </tr>

    <script>
       function play() {
         var audio = document.getElementById("audio");
         audio.play();
       }
     </script>