the build-up and drop The composition of a drop is preceded by a buildup, which is accomplished through a transition from the verse into an interlude of repeating sounds, increased drum speed, and substantial volume growth. For example, in Calvin Harris's "This is What You Came For", the buildup consists of a repeating vocal line, accompanied by a rapidly increasing snare drum tempo, and swells of synthesizers rising in volume. The repetitive vocal lines and increase in volume and tempo create tension that is broken by the full capacity of the drop. Some build-ups end with a bar of silence that adds to the dramatic flair of the drop. The drop of a song may consist of a fuller bass, an affected vocal line, swelling atmospheric synthesizers, layered leads, hard-hitting drums, and white noise. The drop is the loudest and most unique portion of an EDM song. The buildup and verses are meant to bring focus to the drop. This is exemplified in "This is What You Came For", as the drop consists of a catchy vocal sample of the previous lyric "you" chopped up and heavily processed to create a repetitive and enchanting melody. This is complemented by a bass vox, layered house synths, and a high-hat focused drum beat. At the climax of the song, the drop in EDM diverges from the notions of pop songs that are vocal-heavy, and shifts it onto the electronic sounds. Live mixing Drop mixing is a transition technique which involves a sudden switch from one song to the next. There are two ways in which this can be done: "dropping on the one", where the transition occurs at the beginning of the bar, and "dropping at the four", where the transition occurs at the end of the bar. DJs use this technique at the location of the drop: the build-up of one song transitions into the break of another song. This abrupt change in melody or tempo can be used to draw the audience's attention to the performance. A similar drop technique commonly seen in trap and dubstep performances is drop swapping, where the build-ups of two songs are simultaneously played and then swapped at the climax. Suggested physical effects Effects on the brain The brain commonly interprets music through predictions and recognition of melodic patterns. This does not apply to a drop as it subverts musical predictability. For this reason, different