As JohnWilson said, there is no way to do this with a PPT feature. If you use slide transitions and you can calculate the length of time you want the music to play for before the pause, you could edit your music clip to play for the desired amount and then stop. And possibly restart again once video plays but as stated it would be tricky to achieve a seamless transition with the music.

Only work around I can think of is that you have the audio playing on another computer or maybe via a smartphone hooked up to audio speakers and you manually pause the song when the video slide appears, and then Play again when video ends.