Jazz, largely developed from the blues, originated around the
beginning of the 20th century. Improvised jazz singing, called
vocalese, is often compared by musicians and music critics to
the freestyling of rappers within hip hop. Freestyling has also
been said to derive from the art of improvising songs that often
distinguishes jazz. Jazz has influenced hip hop greatly
throughout its entire history; the scat singing of jazz could be
heard in the seminal 1979 old school hip hop song "Rapper's
Delight" by the Sugarhill Gang. To this day, jazz musicians such
as Herbie Hancock collaborate with rappers, creating a sound
that blurs genre lines.