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    Lesson 2. Introducing OMN


    opmo



    Annotation

    This script looks almost the same as the first. And it sounds the same! But there are important differences. First, this expression has changed.

     

    (setf lengths (span pitches '(e)))

     

    The 1/8 has become e. This is an eighth note-length in Opusmodus Notation (OMN).

     

    (setf piano-righthand
          (make-omn
           :length lengths
           :pitch pitches
           :velocity dynamics))
    
    (setf piano-lefthand
          (make-omn
           :length lengths
           :pitch transposed-pitches
           :velocity dynamics))

     

    This function MAKE-OMN turns the parametric output of length, pitch and velocity into a single script of Opusmodus Notation (OMN).

     

    So piano-righthand becomes:

     

    (e c4 p cs4 mp fs4 mf g4 f c5 ff)

     

    and piano-lefthand becomes:

     

    (e c3 p cs3 mp fs3 mf g3 f c4 ff)

     

    This is the preferred way of putting together the parameters that combine to make a musical phrase. It will gradually become obvious why we do this as this guide continues. It does make defining the score more concise:

     

    (piano-rh    
     :omn piano-righthand
     :channel 1
     :sound 'gm
     :program 'acoustic-grand-piano)


    Score

    (setf pitches '(c4 cs4 fs4 g4 c5))
    (setf transposed-pitches (pitch-transpose -12 pitches))
    (setf lengths (span pitches '(e)))
    (setf dynamics '(p< < < < ff))
    
    (setf piano-righthand
          (make-omn
           :length lengths
           :pitch pitches
           :velocity dynamics))
    
    (setf piano-lefthand
          (make-omn
           :length lengths
           :pitch transposed-pitches
           :velocity dynamics))
    
    (setf timesigs (get-time-signature lengths))
    
    (def-score lesson-2
               (:key-signature 'chromatic
                :time-signature timesigs
                :tempo 80
                :layout (piano-layout 'piano-rh 'piano-lh))
      
      (piano-rh    
       :omn piano-righthand
       :channel 1
       :sound 'gm
       :program 'acoustic-grand-piano)  
      
      (piano-lh    
       :omn piano-lefthand)
      )


    Notation

    Screen Shot 2017-12-04 at 20.29.25.png

    Next page Lesson 3. Defining Chords

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