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%I #4 Mar 30 2012 17:34:21
%S 4,8,11,3,8,12,3,7,11,4,6,9,3,6,10,1,8,12,3,7,12,4,7,11,3,6,10,1,7,10,
%T 2,5,11,4,6,9,4,8,11,3,6,10,1,5,9,12,4,7,3,6,10,1,6,10,1,5,10,2,5,9,1,
%U 4,8,11,11,4,6,9,4,8,11,3,6,10,1,5,9,12,4,7,4,8,11,3,8,12,3,7,11,4,6,9,3,6
%N A binary Major Minor chord substitution: Chord progression start vector {4, 11, 9, 2, 5, 7} Cmajor, Gminor,Fminor,BbMajor,Dbminor, Ebminor.
%C This substitution sequence is very like a Jazz chord progression in major (even) and minor (odd) chords. I call it a melt down.
%F Start vector->{4, 11, 9, 2, 5, 7} 1->{1, 4, 8, 11}, 2->{2, 6, 9, 1}, 3->{3, 6, 10, 1}, 4->{4, 8, 11, 3}, 5->{5, 8, 12, 3}, 6->{6, 10, 1, 5}, 7->{7, 10, 2, 5}, 8->{8, 12, 3, 7}, 9->{9, 12, 4, 7}, 10->{10, 2, 5, 9}, 11->{11, 4, 6, 9}, 12->{12, 4, 7, 11}
%t s0[i_] := {i, If[i + 4 > 12,i - 8, i + 4], If[i + 7 > 12, i - 5, i + 7], If[i + 11 > 12, i - 1, i + 11]}; s1[i_] := {i, If[i + 3 > 12,i - 7, i + 3], If[i + 7 > 12, i - 5, i + 7], If[i + 10 > 12, i - 2, i + 10]}; s[i_] := If[Mod[i, 2] == 0, s0[i], s1[i]] t[a_] := Flatten[s /@ a]; p[0] = {4, 11, 9, 2, 5, 7}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]]; p[3]
%Y Cf. A133269, A133270.
%K nonn,uned
%O 1,1
%A _Roger L. Bagula_, Oct 23 2007
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