Can't Hear Track After Exporting

I’m using Windows 7, latest Audacity and the Blue Yeti USB microphone.
I imported a music track and recorded a voice over, it sounds fine through the headphones but when playing back on the PC I only hear the music track. When I export as an MP3 ( I downloaded the conversion file) same thing…only the music track plays…no voice. What’s up??

Where are the headphones plugged in?

Plugged into the microphone. I have unplugged them too.

Ok so nobody knows what’s up here???

Muted tracks in Audacity cannot be heard and are not exported.

Is that the reason?

Or did you turn down the -…+ slider on the voice track?

Or did you select the music track only and do File > Export Selection As?