Final answer:
The two most commercially successful music styles of the early 60s were Surf rock and Motown, appealing to the youth with their energetic, danceable music and a mix of pop with soul for a diverse audience.
Step-by-step explanation:
The two most commercially successful styles of the early 1960s were Surf rock and Motown. These styles overshadowed others in terms of commercial success and widespread popularity during that era. Surf rock emerged from the Pacific Northwest and capitalized on the youth's love for dance and energetic music, as evidenced by bands such as the Ventures with their instrumental hit 'Walk, Don't Run'. Artists and bands associated with the Motown genre included legends like The Supremes, Marvin Gaye, and The Temptations, showcasing a blend of pop with soul that resonated across the nation. The rise of these genres underscored an evolving musical landscape where electric instruments and diverse influences from gospel, blues, country, jazz, and R&B culminated in a vibrant rock and roll scene that became synonymous with the youth culture of the era.