how to play a mp3 audio file in unity ?

Here is my code that will play only wav audio file...

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEditor;

public class Mp : MonoBehaviour { string path; string extension; public GameObject musicAnalysis; string songName; float length; AudioSource song;

 // Use this for initialization
 void Start()
 {
     song = musicAnalysis.GetComponent<AudioSource>();
 }

 // Update is called once per frame
 void Update()
 {
     if (song.isPlaying != true)
     {
         song.Play();
     }
 }

 public void FileSelect()
 {
     //Open windows Exploer 
     path = EditorUtility.OpenFilePanel("Select a Song", "", "");

     print(path);

     //Take the end of the path and save it to another string
     extension = path.Substring(path.IndexOf('.') + 1);

     print(extension);
     //Check if the user has select the correct file
     if (extension == "mp3" || extension == "wav" || extension == "ogg")
     {
         //if correct file process file
         print("You have selected the correct file type congrats");

         LoadSong();
         print("Song Name: " + songName);
         print("Song Length: " + length);
     }
     //if the user selects the wrong file type
     else
     {
         //pop up box that tells the user that they have selected the wrong file
         EditorUtility.DisplayDialog("Error", "Incorrect File Type Please select another", "Ok");
         ////Open windows Exploer 
         path = EditorUtility.OpenFilePanel("Select a Song", "", "");
     }
 }

 void LoadSong()
 {
     WWW www = new WWW("file:///" + path);
     song.clip = www.GetAudioClip();
     songName = www.GetAudioClip().name;
     length = www.GetAudioClip().length;

     while (!www.isDone)
     {
         print("Processing File" + path);
     }

     if (www.isDone == true)
     {
         print("Song has been processed");
         song.Play();
     }
 }

}