What you need: Origaudio Rock-It, $50
Risk level: High
This is the most risky tip on this list. The Rock-It is a device that can turn any object into a speaker—books, boxes, cups, it doesn’t matter. Hollow objects work better. The Rock-It turns your music into vibrations which it sends via its Rock-It Pod to whatever it’s attached to. With your audio notes loaded onto your MP3 player, you can discretely connect it to the Rock-It which will then turn your desk into a speaker. Keep the volume low, and put your head on your desk for a quick listen.