Final answer:
Rockabilly is distinct from R&B and not considered rock and roll for several reasons. These reasons include the lack of energetic beats, the presence of orchestral arrangements, and the raw and country-infused sound of rockabilly.
Step-by-step explanation:
Rockabilly is distinct from R&B and not considered rock and roll for several reasons. The first reason is that rockabilly lacks the energetic beats that are typically associated with rock and roll. Secondly, rockabilly primarily features orchestral arrangements, which is different from the simplicity of rock and roll. Thirdly, rockabilly has a raw and country-infused sound that sets it apart from R&B, but its classification differs from rock and roll due to evolving conventions.