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.
Ragtime fell out of favor as jazz claimed the public's imagination after 1917, but there have been numerous revivals since the music has been re-discovered. First in the early 1940s, many jazz bands began to include ragtime in their repertoire and put out ragtime recordings on 78 rpm records.