They do this, as mentioned above, by individualizing products to give the illusion to consumers that they are in fact purchasing a product or service that was specifically designed for them. Adorno highlights the issues created with the construction of popular music, where different samples of music used in the creation of today's chart-topping songs are put together in order to create, re-create, and modify numerous tracks by using the same variety of samples from one song to another. He makes a distinction between "Apologetic music" and "Critical music". Apologetic music is defined as the highly produced and promoted music of the "pop music" industry: music that is composed of variable parts and interchanged to create several different songs. "The social and psychological functions of popular music that it acts like a social cement" "to keep people obedient and subservient to the status quo of existing power structures."