Does anyone know why my MacBook has an intermittent high-pitched whine?

Today my MacBook started making a high-pitched whine. It's like a high musical note and comes and goes. I closed as many programs as I could. Still working in Chrome (and that's what I have been on when it makes noise). It almost reminds me of a fanbelt issue.... but that's impossible, right?

Yeah, if you go to Programs > Utilities > Audio MIDI Setup
Then select where you want the sound to come from, then click on the settings cog at the bottom, and select Use this device for Sound Output, and you can select the internal speakers for System Alerts & Sound Effects if you wish.

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