non-singleton-pattern.cs

class AaronBehaviour : MonoBehaviour
{
  protected AudioController audio
  {
    get
    {
      return _audio;
    }
  }
  
  private AudioController _audio; // This should theoretically be universal and doesn't get instantiated even when AaronBehaviour is inherited
}

class Player : AaronBehaviour
{
  public AudioClip attackSound;
  void Start()
  {
    audio.PlayClip(attackSound);
  }
}