In this Blog you can learn how to detect music beat and also you can learn how to do musical fun with unity gameObject.

Step 1: Create Empty GameObject and give that name Musical Bars.Inside Musical Bar GameObject Create Vertical bars like this.

Make Sure All Created Vertical bar(cube) must child Of MusicalBars gameobject

Step 2: Create AudioReactor.cs and place below code.

using UnityEngine;
using System.Collections;
public class AudioReactor : MonoBehaviour
{
    private float amp;
    private float[] smooth = new float[2];
    public AudioClip Music1;
    public Camera mainCameraObject;
    public GameObject musicalBarParent;
    private Transform[] musicalBars;
    private Vector3[]defaultMusicalBarSize;
    void Start ()
    {
        musicalBars = musicalBarParent.GetComponentsInChildren ();

        defaultMusicalBarSize = new Vector3[musicalBars.Length];
        for (int i = 0; i < musicalBars.Length; i++) {
            defaultMusicalBarSize [i] = musicalBars [i].transform.localScale;
        }

        //Call Initialize AudioSource
        InitializeAudioSource ();
    }
    void OnEnable (){
    }
    //Initialize Audio Source
    void InitializeAudioSource ()
    {
        GetComponent ().loop = true;
        GetComponent ().clip = Music1; 
        GetComponent ().Play ();
    }  
    void FixedUpdate ()
    {
        //Call Musical Bar
        SetMusicEffect (amp);
    }
    // Update is called once per frame
    void Update ()
    {
        //Change the Camera Size
        mainCameraObject.orthographicSize = 5f + amp / 50;
    }    
    void SetMusicEffect (float amp)
    {
        //Scale Up Scale Down Musical Bar Child's Y axis
        for (int i = 1; i < musicalBars.Length; i++) {
            musicalBars [i].transform.localScale = new Vector3 (defaultMusicalBarSize [i].x, defaultMusicalBarSize [i].y + (amp / Random.Range (1, 5)), defaultMusicalBarSize [i].z);
        }
    } 
    void OnAudioFilterRead (float[] data, int channels)
    {        
        for (var i = 0; i < data.Length; i = i + channels) {
            // the absolute value of every sample
            float absInput = Mathf.Abs (data [i]);
            // smoothening filter doing its thing
            smooth [0] = ((0.01f * absInput) + (0.99f * smooth [1]));
            // exaggerating the amplitude
            amp = smooth [0] * 7;
            // it is a recursive filter, so it is doing its recursive thing
            smooth [1] = smooth [0];
        }
    }
}

Step 3: Create Empty GameObject and give that name AudioReactor.

            -Add AudioSource Component.

           -Add AudioReactor.cs Script
           -Imaport any audio file into your Project