Binary Form refers to music made up of two contrasting melodic ideas. It does not have anything to do with how many notes are used, but rather two different melodies within a song. If you can imagine a song that consisted of simply a verse and then a chorus - that would be binary or AB form.
Jim Along Josie
Bach's Minuet in G
brahms lullaby
Bayan Ko
Are you sleeping, Brother John?
