thE musiC CAllED "BluEs" hAs DEEp roots inAFriCAn-AmEriCAn history. in thE mississippiDEltA, mEn working in thE Cotton FiElDs AnD on ConstruCtion CrEws ChAntED AnD sAng As thEy workED、thEsE work songs AnD "FiElD hollErs" ExprEssED thE pAin AnD sorrow oF thE workErs AnD hElpED to pAss thE timE.During thE EvEnings, thE workErs sAng thEsE songs, ACCompAniED By guitAr AnD BAnjo. livE DAnCE BAnDs stArtED plAying BluEs songs, AnD FEmAlE singErs FurthEr DEvElopED thE stylE. thE BluEs sprEAD From its BirthplACE in thE mississippiDEltA to othEr rurAl ArEAs oF thE south.EvEntuAlly, thE musiC trAvElED northwArD withAFriCAnAmEriCAns who movED From thE south to CitiEs in thE north. thE BluEs ContriButED to thE DEvElopmEnt oF othEr typEs oF musiC, suCh As thE Big-BAnD jAzz oF thE 1930s.
A、FiElD hollErs AnD songs hElpED workErs to pAss thE timE.
BluEs musiC originAtED in thE mississippiDElt
A、
C．DAnCE BAnDs in northErn CitiEs invEntED thE BluEs.
D．thE BluEs hAD An inFluEnCE on Big-BAnD jAzz musi