macOS High Sierra 10.13.6 empty trash sound playing repeatedly

I am trying to figure out how to convert a piece of sheet music to XML file for a student. I heard about Pizzicato app for macOS. I downloaded it, and then attempted to use it (couldn’t figure it out). When I closed Pizzicato app, (it was using and then deleted it, it kept making the trash can sound over and over again.

Did I mess something up by not following a procedure correctly? I don’t know anything about Unix/macOS, other than it’s reference in Jurassic Park 😉 This is a brand new MacBook and I’m nervous something’s awry. I restarted it right after it started making the sound and it did it well, and it feels like all the programs are running OK.

Should I take it in to have someone look at it?