Final answer:
Engineers developed a fuzz box for the bass on Harrison's 'Think for Yourself', contributing to the distorted sound that would become characteristic of rock music.
Step-by-step explanation:
The device engineers came up with for the bass on George Harrison's "Think for Yourself" was a fuzz box, which was used to create a distorted bass sound. This effect represented an early form of guitar distortion, contributing to the evolution of rock and roll music. The combination of electric instruments with various music genres such as gospel, blues, country, jazz, and R&B led to the creation of rock and roll. This amalgamation produced a sound that had a heavy rhythm, resonating particularly with teenagers and thus becoming an instant success in popular culture.