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    public AudioSource music;

    void OnTriggerEnter2D(Collider2D other)

    {

        music.Play();

    }

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    private AudioSource[] allAudioSources;

    void OnTriggerEnter2D(Collider2D other) 

    {

         allAudioSources = FindObjectsOfType(typeof(AudioSource)) as AudioSource[];

         foreach( AudioSource audioS in allAudioSources ) {

              audioS.Stop();

         }

    }