▁structures ▁ar ouse ▁particular ▁expect ations . ▁ ▁History ▁Meyer ▁( 1 9 5 6 ) ▁applied ▁Gest alt ▁psych ology ▁principles ▁to ▁musical ▁expectation , ▁resulting ▁in ▁his ▁ideas ▁about ▁completion , ▁closure , ▁and ▁his ▁Law ▁of ▁Good ▁Cont inu ation . ▁In ▁ 1 9 7 7 , ▁N arm our ' s ▁book ▁exp licated ▁problems ▁he ▁had ▁with ▁Sch en ker ian ▁analysis ▁and ▁sketch ed ▁ideas ▁for ▁a ▁new ▁model ▁of ▁analysis ▁based ▁on ▁ ▁musical ▁expectation ▁as ▁informed ▁by ▁the ▁work ▁of ▁Meyer . ▁N arm our ▁mentioned ▁a ▁forth coming ▁book , ▁The ▁Mel od ic ▁Str ucture ▁of ▁T onal ▁Music , ▁but ▁it ▁did ▁not ▁appear . ▁Much ▁time ▁passed ▁without ▁the ▁alternative ▁theory , ▁but ▁finally ▁in ▁ 1 9 8 9 ▁N arm our ▁published ▁his ▁I - R ▁model , ▁detailed ▁in ▁the ▁ 1 9 9 0 ▁and ▁ 1 9 9 2 ▁books . ▁ ▁As ▁of ▁ 2 0 0 7 , ▁N arm our ▁is ▁working ▁on ▁a ▁new ▁book , ▁which ▁will ▁extend ▁the ▁I - R ▁theory ▁to ▁the ▁parameters ▁of ▁harm ony ▁and ▁rh ythm ▁and ▁explore ▁potential ▁applications ▁to ▁the ▁analysis ▁of ▁performance . ▁ ▁Theory ▁N arm our ' s ▁I - R ▁model ▁was ▁published ▁in ▁two ▁separate ▁books , ▁dealing ▁with ▁" basic ▁mel od ic ▁structures " ▁and ▁" mel od ic ▁complexity ". ▁Each ▁book ▁is ▁quite ▁complex ; ▁only ▁a ▁few ▁key ▁points ▁are ▁mentioned ▁here