We have tried

Paul Smith (who designed the javascript which has allowed my design to be functional) and I have done extensive testing of the flash/javascript system and it does seem to function without problems on all of the major browsers. That would be -
On Windows - Internet Explorer (7 or later), Opera and Firefox
On Linux - Opera and Firefox
On Mac - Safari, Opera and Firefox

However, we cannot plan for absolutely all potential scenarios. We do know that the system DOES NOT work on Internet Explorer 6.

Why no music?

If you've clicked the play button, seen the animation & still aren't hearing anything, you might try:
Clicking play again
Clicking reload
Clicking shift + reload
Closing the tab and reopening the page in a new tab
Or, if all else fails, shutting down the browser and starting over.