“The most recent fad to catch on with kids in our big cities and metropolitan areas is rapping,” the Blondie singer explained to the audience on the network variety show “Solid Gold,” in 1981. After mentioning some of the genre’s rising stars from the Bronx — the Sugarhill Gang, Grandmaster Flash, the Funky 4 + 1 — Harry introduced her band’s latest rap-inspired video. “Using our new single, ‘Rapture,’” Harry said, in a professorial tone, “Blondie and some of our friends put together a number to show you what rapping in the street scene is like.”