gotoAndPlay("label") function

Hi,
I am new to flash and I hope somebody can help me on this.

I have a main flash file (A.swf). In the first frame I use the load Movie function to load a second swf file (B.swf) in a movieclip called contents

_root.contents.loadMovie(“B.swf”); (OK so far)

the A.swf file contains a button.

On release of this button I would like to goAndPlay starting from a frame in the B.swf., this frame is labeled “music”.

I tryed this code
on (release) {
_root.contents.gotoAndPlay(“music”)
}
but it does not work.

How can I do?
Thanks