Sugarhill Gang, Grandmaster Flash, the Funky 4 + 1 were first but Kurtis Blow expanded it to bigger audience.
"Critical Rap Theory" :
In 1979, at the age of twenty,
Kurtis Blow became the first rapper to be signed by a major label, Mercury, which released "Christmas Rappin'".[5] It sold over 400,000 copies........
Kurtis Walker (born August 9, 1959),[2] professionally known by his stage name Kurtis Blow, is an American rapper, singer, songwriter, record/film producer, b-boy, DJ, public speaker and minister.[3]
He is the first commercially successful rapper and the first to sign with a major record label.[4] "The Breaks", a single from his 1980 self-titled debut album, is the first certified gold record rap song. Throughout his career he has released 15 albums and is currently an ordained minister.[2]....
https://en.wikipedia.org/wiki/Kurtis_Blow
Dear Blondie stop stealing this Black man's history.
PS : Columbus didn't "discover" shit here either.
