Manage background music. (For Unity3d)

BGMManager.cs

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

[AddComponentMenu("Scripts/BGM/BGMManager")]
public class BGMManager : MonoBehaviour
{
	AudioSource audioSource;

	public List<AudioClip> audioClips ;

	public string BgmName {
		get {
			return audioSource.clip.name;
		}
	}

	void Start ()
	{
		audioSource = GetComponent <AudioSource> ();
	}

	public bool Play ()
	{
		return Play (BgmName);
	}

	public bool Play (string bgmName)
	{
		if (PrepareClipWithName (bgmName)) {
			audioSource.Play ();
			return true;
		} else {
			Debug.LogWarning ("Invalid BGM.");
			return false;
		}
	}

	public void Stop ()
	{
		audioSource.Stop ();
	}

	public bool PrepareClipWithName (string name)
	{
		return (audioSource.clip = FindClipWithName (name));
	}

	AudioClip FindClipWithName (string name)
	{
		return audioClips.Find (
			delegate(AudioClip obj) {
			return (obj.name == name);
		});
	}
}

Usage:

bgmManager.Play ("best_song_ever");

or you can choose more safety way

if (bgmManager.PrepareClipWithName ("best_song_ever")) {
bgmManager.Play ();
}