Found via a Unity answer and thought it was interesting. http://answers.unity3d.com/questions/897466/is-it-possible-to-render-spectrum-data-onto-a-ui-i.html

AudioWaveFormVisualizer.cs

using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 //[RequireComponent(typeof(AudioSource))]
 [RequireComponent(typeof(GUITexture))]
 public class AudioWaveFormVisualizer : MonoBehaviour
 {
     
     public AudioSource MusicPlayer;
     public int width = 500; // texture width 
     public int height = 100; // texture height 
     public Color backgroundColor = Color.black; 
     public Color waveformColor = Color.green; 
     public int size = 2048; // size of sound segment displayed in texture
     
     private Color[] blank; // blank image array 
     private Texture2D texture;
     private float[] samples; // audio samples array
     
     IEnumerator Start ()
     { 
         
         // create the samples array 
         samples = new float[size]; 
         
         // create the texture and assign to the guiTexture: 
         texture = new Texture2D (width, height);
         
         guiTexture.texture = texture; 
         
         // create a 'blank screen' image 
         blank = new Color[width * height]; 
         
         for (int i = 0; i < blank.Length; i++) { 
             blank [i] = backgroundColor; 
         } 
         
         // refresh the display each 100mS 
         while (true) {
             GetCurWave (); 
             yield return new WaitForSeconds (0.1f); 
         } 
     }
     
     void GetCurWave ()
     { 
         // clear the texture 
         texture.SetPixels (blank, 0);
 
         
         // get samples from channel 0 (left) 
         MusicPlayer.GetOutputData (samples, 0); 
         
         // draw the waveform 
         for (int i = 0; i < size; i++) { 
             texture.SetPixel ((int)(width * i / size), (int)(height * (samples [i] + 1f) / 2f), waveformColor);
 
         } // upload to the graphics card 
         
         texture.Apply ();
     } 
 }