Everyone is pretty familiar with the often satirized image of heavy metal. Speedy beat, strong electronic guitar riffs, and an over-emphasis on volume. As far as its name goes, some have attributed it to the works of William S. Burroughs, but most will say the origin lies in Steppenwolf's classic song "Born To Be Wild" in a verse that said "Heavy Metal Thunder".
Funk is an offshoot of R&B music that emphasized the finer points of Jazz and Soul. One of the greatest influences of funk was the new emphasis on the bass guitar, an instrument hardly used in rock bands of that era, but now a requirement. Especially common in funk songs was the use of the slap bass technique, a style that is generally credited to Larry Graham of Sly and the Family Stone.