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.
Searching for ragtime song brought up a bunch of links that will have songs to listen to. Ragtime is short for ragged time, an early syncopation. What ragtime actually is or was is a musical genre. Disco is a genre, dance beat and true rock and roll (like Chuck Berry) are genres. They have a typical beat and people make music around that typical beat. These things above all have a distinctive sound because the music all starts from a certain beat.