Binary – The structure of a piece of music which is divided into two different sections

(Pronounced buy-nuh-ree)

To remember what binary means use the following mnemonic:

Don't buy this ordinary (binary) song, it only has two sections.

Binary music describes the structure of a piece of music which is divided into two different sections, commonly shown as A and B. The contrast in sound between these sections is often created by a key change.