It is tempting to confuse pop music with popular music . The New Grove Dictionary Of Music and Musicians , the musicologist 's ultimate reference resource, identifies popular music as the music since industrialization in the 1800s that is most in line with the tastes and interests of the urban middle class. This would include an extremely wide range of music from vaudeville and minstrel shows to heavy metal . Pop music, on the other hand, has primarily come into usage to describe music that evolved out of the rock 'n roll revolution of the mid-1950s and continues in a definable path to today.
The fourfold models used to describe individual attitudes of immigrants parallel models used to describe group expectations of the larger society and how groups should acculturate.  In a melting pot society, in which a harmonious and homogenous culture is promoted, assimilation is the endorsed acculturation strategy. In segregationist society, in which humans are separated into racial groups in daily life, a separation acculturation strategy is endorsed. In a multiculturalist society, in which multiple cultures are accepted and appreciated, individuals are encouraged to adopt an integrationist approach to acculturation. In societies where cultural exclusion is promoted, individuals often adopt marginalization strategies of acculturation.