While there is some debate over the number of elements of hip-hop, there are four elements that are considered to be its pillars: deejaying, or “turntabling”; rapping, also known as “MCing” (emceeing) or “rhyming”; graffiti painting, also known as “graf” or “writing”; and break dancing, or “B-boying,” which encompasses hip-hop dance, style, and attitude, along with the sort of virile body language that philosopher Cornel West described as “postural semantics.” Many also cite a fifth essential component: “knowledge of self/consciousness.” Other suggested elements include street fashion and language.
Infrastructure, because it's not a part of the environment, it's not a form of transportation, not a service either. Thus the only remaining answer is Infrastructure
