Final answer:
The form where the music is the same for each stanza is called strophic form, providing a repetitive musical structure to the song.
Step-by-step explanation:
The vocal form where the music is the same for each stanza of a poem or song is known as strophic form. In strophic form, each stanza or verse of the text is sung to the same music, creating a simple and repetitive structure. This form contrasts with others like the song cycle, which is a group of songs designed to be performed in a sequence as a single entity, and through-composed form, which does not repeat music for stanzas. The modified strophic form varies the music slightly to adapt to the emotional content of each stanza, but maintains a foundational recurring melody.