Zenwatch & S7 what is that sound for?

[Doug6388]

I have a Zenwatch 2 & a Galaxy S7 set up with chirps, music strums, phone ringing sounds for various notifications. I am minding my own business and I hear a music strum, I look at the watch face ... nothing, I look at the S7 notifications ... nothing. Is there someplace to look & see a sound notification and what the sound was alerting me of? A notification history page? If not, why not. Is there an app or widget I could download?