Looping music wont play

I am loading a movie in another flash movie clip. The first movie “animation.swf” has background music that loops twice.

Linked in the library as “Song” and played as below:

loopMusic = new Sound ();
loopMusic.attachSound (“Song”);
loopMusic.start (0,2);

It plays fine, but when that file is loaded in the main movie using loadMovie the sound doesn’t play.

Any ideas?