Devices of all kinds in this class for storing and displaying printed matter and/or symbols including letters and other symbols and indicia relevant to the display, teaching and calculation of musical scales, chords, melodies and other combinations of sound both spatial and temporal; music books; printed music; music paper; music lesson books; paper for music writing; instructional and teaching material in this class including revolving indicators or calculators including those comprising a plurality of relatively rotatable components in a transparent or partly-transparent or translucent plastics jacket or sleeve; all other goods in this class