Question Music player little question

Hey, I want to make music player with more then 2 audio sources.
how this script line should be for more then 2 audio sources?

Code (CSharp):

1.     public void PlayMusic(AudioClip musicClip)
2.     {
3.         AudioSource activeSource = (FirstMusicSourceIsPlaying) ? musicSource : musicSource2;
4.         activeSource.clip = musicClip;
5.         activeSource.volume = 1;
6.         activeSource.Play();
7.     }
8.     public void PlayMusicWhiteFade(AudioClip newClip, float transitionTime = 1.0f)
9.     {
10.         AudioSource activeSource = (FirstMusicSourceIsPlaying) ? musicSource : musicSource2;
11.         StartCoroutine(UpdateMusicWithFade(activeSource, newClip, transitionTime));