4. Pluck the rubber band again. A second student should use the hand lens magnifier to observe the rubber band. 5. With your fingers, pull the rubber band tighter across the box and pluck it again. Is the sound higher or lower? 6. Use a hand lens to observe the rubber band again. Do you notice whether it is moving back and forth faster when the sound is higher? 7. What changed when the tissue box guitar was making a sound?