y ' s ▁Hot ▁ 2 0 ▁were ▁both ▁re brand ed ▁to ▁American ▁Top ▁ 2 0 ▁when ▁they ▁launched ▁on ▁their ▁new ▁home . ▁ ▁Source ▁material ▁Cont inu ing ▁the ▁practice ▁that ▁all ▁of ▁Kas em ' s ▁count down s ▁had ▁util ized ▁since ▁ 1 9 9 2 , ▁both ▁ed itions ▁of ▁American ▁Top ▁ 2 0 ▁used ▁the ▁week ly ▁main stream ▁and ▁hot ▁adult ▁contemporary ▁radio ▁air play ▁surve ys ▁compiled ▁by ▁the ▁trade ▁paper ▁Radio ▁& ▁Records . ▁The ▁survey ▁later ▁was ▁conducted ▁through ▁Medi abase ▁ 2 4 / 7 ▁and ▁published ▁in ▁R & R , ▁save ▁for ▁a ▁brief ▁period ▁in ▁ 2 0 0 0 ▁and ▁ 2 0 0 1 ▁when ▁the ▁results ▁were ▁un pub lished . ▁After ▁R & R ▁fol ded , ▁Medi abase ▁began ▁publishing ▁the ▁week ly ▁survey ▁in ▁USA ▁Today . ▁ ▁Show ▁format ▁Each ▁count down ▁was ▁three ▁hours ▁in ▁length . ▁A ▁brief ▁rund own ▁of ▁the ▁format ▁appears ▁below . ▁ ▁Songs ▁That ▁To pped ▁The ▁Chart ▁Last ▁Week : ▁Kas em ' s ▁standard ▁practice ▁of ▁rec ount ing ▁the ▁top ▁three ▁songs ▁from ▁the ▁week ▁before . ▁Chart ▁Ext ras : ▁To ▁fill ▁out ▁the ▁three ▁hours , ▁past ▁chart ▁hits ▁from ▁the ▁ 1 9 7 0 s ▁on ward ▁would ▁be ▁played ▁at ▁various ▁intervals . ▁The ▁ones ▁dub bed ▁Ext ras ▁would ▁have ▁a ▁story ▁behind ▁them , ▁as ▁Kas em ▁was ▁known ▁to ▁do