What is the term for the main part of a poem or song?

The term that refers to the main part of a poem or song is "Chorus." In the context of songs, the chorus typically represents the central theme or message and is repeated several times throughout the piece, making it the most recognizable part. It often contains the hook and is designed to be memorable, providing emotional impact and reinforcing the core message of the song.

In poetry, while "verse" and "stanza" refer to specific structural elements, they do not denote the main thematic aspect. A verse is a line or a section of the poem, and a stanza is a grouped set of lines, similar to a paragraph in prose. "Bridge" also has a specific function in songs, as it provides a contrast to the chorus or verses, but it is not the primary or recurring element. Therefore, the "Chorus" stands out as the correct choice for the main part of a song, emphasizing its role in conveying the central theme.