Graffiti as an element of hip hop

An aerosol paint can, common tool for modern graffiti
In America around the late 1960s, graffiti was used as a form of expression by political activists, and also by gangs such as the Savage Skulls, La Familia, and Savage Nomads to mark territory. Towards the end of the 1960s, the signatures—tags—of Philadelphia graffiti writers Cornbread, Cool Earl and Topcat 126 started to appear.[15][16] Cornbread is often cited as one of the earliest writer of modern graffiti[17]. Around 1970-71, the centre of graffiti innovation moved to New York City where writers following in the wake of TAKI 183 and Tracy 168 would add their street number to their nickname, "bomb" a train with their work, and let the subway take it—and their fame, if it was impressive, or simply pervasive, enough—"all city". Bubble lettering held sway initially among writers from the Bronx, though the elaborate writing Tracy 168 dubbed "wildstyle" would come to define the art.[15][18] The early trendsetters were joined in the 70s by artists like Dondi, Zephyr and Lady Pink.[15]
Graffiti is one of the four main elements of hip hop culture (along with rapping, DJing, and break dancing).[19] The relationship between graffiti and hip hop culture arises both from early graffiti artists practicing other aspects of hip hop, and its being practiced in areas where other elements of hip hop were evolving as art forms. By the mid-eighties, the form would move from the street to the art world. Jean-Michel Basquiat would abandon his SAMO tag for art galleries, and even street art's connections to hip hop would loosen. Occasional hip hop paeans to graffiti could still be heard throughout the nineties, however, in tracks like the Artifacts' "Wrong Side of Da Tracks", Qwel's Brick Walls and Aesop Rock's "No Jumper Cables".