(also pop music) [mass noun] commercial popular music, in particular accessible, tuneful music of a kind popular since the 1950s and sometimes contrasted with rock, soul, or other forms of popular music:their quasi-psychedelic pop is pleasantly uplifting and danceable
adjective
[attributive]
1relating to commercial popular music:a pop stara pop group
2often derogatory (especially of a scientific or academic subject) made accessible to the general public; popularized:pop psychology