NSSound Class help

[MacProgramer]

ok i am currently teaching myself how to develop for Leopard

(Cocoa + Objective-C)

 

i need help with a program using the NSSound Class

 

here is the code

 

#import "AppController.h"

@implementation AppController
- (IBAction)playMusic:(id)sender

{
NSSound* sound = [[NSSound alloc] initWithContentsOfFile: @"/Users/HomePortal/Music/TI - Whatever You Like.mp3" byReference:YES];
[sound play];
}

- (IBAction)stopMusic:(id)sender
{

}

@end

 

how do i get the action stopMusic: to stop the music when i press the button linked to the action stopMusic:

 

, any help would be appreciated