When studying English poetry, repeated mention of terminologies such as, stressed syllable and unstressed syllable are hard to miss, and here at O, we have discussed quite many stressed and unstressed syllabic situations.
Qualitative meter is a metrical pattern of stressed and unstressed syllables which occur at regular intervals in a verse.
For it to be a qualitative meter the syllabic patterns of the verse may include one or more of these foot types: iamb, spondee, trochee, pyrrhus, dactyl, and anapest. Most Romance languages use qualitative meter and the metrical patterns would vary according to the sonority of the language.