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.
Scott Joplin was the King of Ragtime Writers, a composer who elevated banjo piano playing, a lowly entertainment associated with saloons and brothels, into an American art form loved by millions. Born in Texas in either 1867 or 1868, Joplin was raised in Texarkana, the son of a laborer and former slave.