PowerPoint Help - Music Track

I'm compiling about a 15-min PowerPoint slide presentation for a person at our company who is retiring in the next few days. Does anyone have a clue as to how I can get a custom-length audio (music) track to span the entire PowerPoint presentation, from start to finish without interruption . . . and, so that the music would conclude at the very end of the last slide?

If you know the lenght of the music track in seconds, then devide it by the number of frames that you want to present. Now set the very first frame's timing to this value and then there should be a button which applies the timing to all of the slides.

Otherwise there are no real way of automating this procedure.

Thanks so much for your help. I really appreciate it.

Larry