Final answer:
Herbie Hancock is an accomplished musician, renowned for his work as a jazz pianist and his influence in blending various genres into his music.
Step-by-step explanation:
Herbie Hancock's primary field of expertise is music. He is an acclaimed pianist, keyboardist, bandleader, composer and innovator in jazz and contemporary music. His career spans decades, during which he has won numerous awards, including multiple Grammy Awards.
Hancock is well-known for his contributions to jazz, but he's also adept at blending various musical elements from funk, soul, and electronic music into his works.