Final answer:
Rockabilly is the genre of country music that incorporated drums, a heavy backbeat, and the electric guitar, contributing to the emergence of rock 'n' roll.
Step-by-step explanation:
The style of country music which used drums, a heavy backbeat, and the electric guitar is known as Rockabilly. This musical genre was a precursor to the broader category of rock 'n' roll. It represents a fusion of sounds from country to blues, and its electrified nature allowed artists like Elvis Presley to captivate audiences with a revolutionary approach to music. The combination of electric instruments with the sounds of gospel, blues, country, jazz and R&B gave birth to this new sound. Rockabilly artists like Carl Perkins with songs like "Blue Suede Shoes" and Elvis Presley with his mix of R&B and country on records such as "That's All Right" and "Blue Moon of Kentucky" show the powerful blend of cultures and musical styles that defined this genre.