Hypnagogic pop is pop or psychedelic music that evokes cultural memory and nostalgia for the popular entertainment of the past. It emerged in the mid to late 2000s as American lo-fi and noise musicians began adopting retro aesthetics remembered from their childhood, such as radio rock, new wave pop, light rock, video game music, synth-pop, and R&B. Recordings circulated on cassette or Internet blogs and were typically marked by the use of outmoded analog equipment and DIY experimentation.

Progressive pop is pop music that attempts to break with the genre's standard formula, or an offshoot of the progressive rock genre that was commonly heard on AM radio in the 1970s and 1980s. It was originally termed for the early progressive rock of the 1960s. Some stylistic features of progressive pop include hooks and earworms, unorthodox or colorful instrumentation, changes in key and rhythm, experiments with larger forms, and unexpected, disruptive, or ironic treatments of past conventions.