Your child has developed a fear of sleeping in the dark. Using some of the principles of learning theory:

"social stratification refers to the way people are ranked and ordered in society. in western societies, stratification is primarily seen and understood as a result of socioeconomic status, which produces a hierarchy in which access to resources, and possession of them, increases from the lower to the upper strata"

i feel as if they would both catch on before to long because they would see them to frequent

answer; not notated (at least, not in the traditional sense) and includes many improvised sections and solos;