Final answer:
Herbie Hancock's album "Headhunters" featured a radical new sound known as Fusion Jazz, which mixed jazz with funk, rock, and R&B, using electric instruments.
Step-by-step explanation:
The electric bass and keyboard/synthesizers on Herbie Hancock's album "Headhunters" gave jazz a radical new sound, sometimes called Fusion Jazz. This genre is a result of the combination of traditional jazz with various other musical styles, including funk, rock, and R&B, which were prevalent during the 1970s, the era when "Headhunters" was released.
Fusion Jazz is known for its complex arrangements and use of electric instruments, which was a departure from the acoustic sounds typically associated with earlier forms of jazz. As part of a broader movement, Herbie Hancock's work on "Headhunters" was instrumental in pushing the boundaries of jazz and contributing to its evolution, creating a sound that resonated with the audiences of the time and still influences musicians today.