Here's a real challenge -- I'd rank this one as hard... but maybe you'll surprise me.
Situation: You're a beginning music composer, and you're listening to a recording of a piece of music. In the middle, there's the sound of a wonderful wind-chime thing... that's precisely what you want -- but what's it called?
You already know what most instruments are -- but you can't figure out this one.
What's the name of the instrument that makes this sound? What's the proper name for it?
Mystery instrumental sound
And, so you won't waste time, it's NOT a wind chime, or anything like "tinkly bells." It has a real name that's not 100% obvious.