6 9 ▁with ▁a ▁synd ic ated ▁program ▁from ▁the ▁ABC ▁Radio ▁Network ▁entitled ▁" L ove ", ▁voice - track ed ▁by ▁" Bro ther ▁John " ▁R yd gren , ▁and ▁which ▁a ired ▁from ▁ 7 ▁PM ▁to ▁ 1 ▁AM . ▁Short ly ▁afterwards , ▁W LS - FM ▁adopted ▁a ▁full - time ▁progress ive ▁rock ▁format . ▁ ▁Rock ▁to ▁disco ▁to ▁top ▁ 4 0 ▁In ▁ 1 9 7 0 , ▁ABC ▁decided ▁to ▁change ▁the ▁call ▁signs ▁on ▁all ▁of ▁their ▁FM ▁radio ▁stations ▁in ▁order ▁to ▁distinguish ▁them ▁from ▁their ▁co - owned ▁AM ▁( and ▁ex cluding ▁two ▁mark ets , ▁TV ) ▁counter parts ; ▁this ▁not ▁only ▁included ▁W LS - FM , ▁but ▁W ABC - FM / 9 5 . 5 — New ▁York ▁City , ▁W XY Z - FM / 1 0 1 . 1 — Det roit , ▁K XY Z - FM / 9 6 . 5 — H ou ston , ▁K GO - FM / 1 0 3 . 7 — San ▁Francisco , ▁and ▁K Q V - FM / 1 0 2 . 5 — P itt s burgh . ▁While ▁ABC ▁had ▁originally ▁selected ▁W X AI ▁as ▁a ▁replacement ▁call ▁sign ▁for ▁W LS - FM , ▁W DA I ▁for ▁W XY Z - FM , ▁and ▁W RI F ▁for ▁W ABC - FM , ▁the ▁F CC ▁instead ▁assigned ▁W RI F ▁as ▁W XY