An algorithmic combo-instrument slide ruler for musical reference, comprising:
- a) a multitude of slidable combo-instrument tuning cards of thin opaque sheet materials having each a front side and a back side, said opaque sheet materials having first music indicia that of a string instrument, and a keyboard instrument, or a combination string and keyboard instrument disposed visible on at least one of said front or back sides;
- and
- b) a multitude of scale and mode inserts of thin transparent sheet materials having each a front side and a back side, said front sides having each their own unique color display of predetermined semi-opaque second music indicia relative to its musical scale or mode having;
- (1) an array of finger position windows allowing for some of said first music indicia to be visible there through;
- and
- (2) dependant finger position data boxes some of which indicating scale, interval, and chord information printed thereon;
- and
- (3) a scale or mode name box providing the name of the resident scale or mode type and instrument tuning;
- and
- c) a rectangular sleeve housing of thin transparent material having a top surface and a bottom surface and a front surface and a back surface and two opposing open ends, said housing including,
- (1) semi-opaque housing indicia visible on said top surface, bottom surface, front surface, and back surface providing for a limited view of underlying layers;
- along with
- (2) a group of paired parent windows and dependant child windows arranged in a reticulated manner, with atleast some of both first music indicia and second music indicia visible there through the said parent window, and said dependant finger position data boxes visible there through the dependant child windows;
- and
- (3) a scale or mode name window allowing there through said scale or mode name box to be visible;
- d) one scale or mode insert is selected from said multitude of scale and mode inserts and placed in front of one relative selected said slidable combo-instrument tuning card becoming the active scale or mode insert, and the remainder of said multitude of scale and mode inserts are placed behind said combo-instrument tuning card becoming stored multitude of scale and mode inserts;
- and then said stored multitude of scale and mode inserts, said slidable combo-instrument tuning card, and said active scale or mode insert are disposed together between said front and back surfaces of the said rectangular sleeve housing allowing said slidable combo-instrument tuning card to extend beyond the left side of said stored multitude of scale and mode inserts, said active scale or mode insert, and said open end of said housing for moving the slidable combo-instrument tuning card to a desired position relative to said finger position windows and said parent windows for displaying there through said parent windows disclosed first music indicia and said finger position windows while displaying undisclosed first music indicia through said semi-opaque second music indicia, and for displaying said dependant finger position data boxes there through said dependant child windows providing substantially all music information related to said active scale or mode insert to include natural and artificial chords, scales, intervals, inversions of intervals, transpositions, while defining spaced octaves on a multi-instrument cross referencing level.