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 (c.1867-1917) is known as the King of Ragtime.. One of the earliest African-American composers to have his works published, Joplin brought a classical sensibility to ragtime, which had served as music for popular entertainment rather than as art music.Although he is best known for his piano rags, he also wrote several songs and the opera Treemonisha.ne of the earliest African-American composers to have his works published, Joplin brought a classical sensibility to ragtime, which had served as music for popular entertainment rather than as art music. Although he is best known for his piano rags, he also wrote several songs and the opera Treemonisha.