The Boogie-woogie style focused on solo piano playing, as if the sound of an entire big band was produced from the keys of the piano. It often followed the twelve-bar blues structure.
This style of blues was very relevant in the 30s and 40s mainly by the American black community. Its most striking feature is the syncopated use of the left hand on the piano.
It can be understood as a mixture of gospel, country and blues styles, having emerged without classical influences, but in nightclubs where the style was popularized.
Therefore, this style of blues differed from the original blues for having a faster and more danceable rhythm, being a success in the United States until the year 1942.
Perfect fifth because you are going from do to so which is 5 steps apart :) so do to ti would be a perfect seventh since theyre seven steps apart. a perfect octave would be do to do.