Given the task definition and input, reply with output. In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: In 1976—first in London, then in the United States—"New Wave" was introduced as a complementary label for the formative scenes and groups also known as "punk"; the two terms were essentially interchangeable. NME journalist Roy Carr is credited with proposing the term's use (adopted from the cinematic French New Wave of the 1960s) in this context. Over time, "new wave" acquired a distinct meaning: bands such as Blondie and Talking Heads from the CBGB scene; the Cars, who emerged from the Rat in Boston; the Go-Go's in Los Angeles; and the Police in London that were broadening their instrumental palette, incorporating dance-oriented rhythms, and working with more polished production were specifically designated "new wave" and no longer called "punk". Dave Laing suggests that some punk-identified British acts pursued the new wave label in order to avoid radio censorship and make themselves more palatable to concert bookers.Bringing elements of punk rock music and fashion into more pop-oriented, less "dangerous" styles, new wave artists became very popular on both sides of the Atlantic. New wave became a catch-all term, encompassing disparate styles such as 2 Tone ska, the mod revival inspired by the Jam, the sophisticated pop-rock of Elvis Costello and XTC, the New Romantic phenomenon typified by Ultravox, synthpop groups like Tubeway Army (which had started out as a straight-ahead punk band) and Human League, and the sui generis subversions of Devo, who had gone "beyond punk before punk even properly existed". New wave became a pop culture sensation with the debut of the cable television network MTV in 1981, which put many new wave videos into regular rotation. However, the music was often derided at the time as being silly and disposable.
What were the two terms that were essentially interchangeable?