Answer:
a. theme
Step-by-step explanation:
"theme" is the least relatable concept of musical form
- binary: When instead of repeating the melody (the same musical idea), we decided to create a contrasting part, the music has two parts, and we call this structure the Binary Form. The binary form is one of the simplest in music, and consists of only two sections, called A and B.
- simple strophic: In this form we have the liturgical hymns and choirs, in which Theme "A" is the presented verse and with each new stanza the melodic theme is repeated.
- timbre: Timbre is the peculiar characteristic of each sound. It is what differentiates two sounds of the same frequency (same note).