Branch Retinal Artery Occlusion - Pathophysiology. 1  Most commonly, a branch retinal artery occlusion occurs secondary to an embolus. Emboli typically originate within vessels upstream where they dislodge and travel within the circulatory system to ultimately become lodged downstream in a vessel with a smaller lumen.
Ragtime is a musical form or style that is defined as a syncopated melody (usually in 2/4 time) over a regular, march tempo bass line. Improvisation was common but little of that aspect has been preserved.
African American composer and pianist; the best-known composer of ragtime music. Between 1895 and 1915, he composed many of the classics of the ragtime repertoire. and helped popularize the style through his piano arrangements, published as sheet music. His first successful piece was Maple Leaf Rag (1898).