Abbreviation for ‘popular’. Earlier meaning meant concerts appealing to a wide audience. The London Popular Concerts were founded by Benedict in 1858 and continued until 1898. Since the late 1950s, however, pop has had the special meaning of non‐classical mus., usually in the form of songs, perf. by such artists as the Beatles, the Rolling Stones, Abba, etc. Thus ‘pop groups’ (performers of pop, usually singer(s), guitars, drums, sometimes sophisticated elec. effects), and ‘pop festivals’.