I can only now answer this mail (11.07) by Michael Snider, as I've been cut off from the internet for a week by our incompetent provider. The qasida is a usually tripartite verse form originally developed orally by the Bedouin that was more or less superseded by the ghazal; there are imitations by Tennyson ("Locksley Hall") and Platen, according to _The Princeton Encyclopedia of Poetry and Poetics_ ~ I can only find ghazals among Platen's work. It seems to me to be totally unrelated to the sonnet in either rhyme-scheme or structure. The Occitanian word "trobar" means to find, as in French "trouver", in the sense of invent. The theory of the influence of Arabic love poetry on the so-called troubadours remains unproven, as far as I know. Martin