Swayam Sahoo

Chord

Overview

The chord class can be accesed within a Part object of a Scopul object. It has 4 properties: name, measure, velocity, length

Here’s an example of how you could get a chord object:

from Scopul import Scopul

scop = Scopul("test.mid")

# Get parts
parts = scop.parts

# Get random part's sequence
random_part = parts[0].sequence

# Lets say, for example, 
# random_part = [<Sequence.Chord object at 0x0000024774D85190>, <Sequence.Rest object at 0x0000024774D1D9D0>]

chord = random_part[0] # Getting the first object in the sequence, which is a chord

Creating a Chord object

Chord(self, m21=None, notes: list = None, measure=None)

You can create your own note class, which you may use to append to the existing MIDI or use for other purposes

Args

• m21 : A music21 object
• notes: A list of Note objects
• measure: The measure number of the note

To make it your self:

from Scopul import Note, Chord

N1 = Note(name="C#4", length=1.5)
N2 = Note(name="E4", length=1.5)
N3 = Note(name="G4", length=1.5)

my_note = Chord(notes=[N1, N2, N3], measure=5)

To use a music21 object to create a Note object:

from Scopul import Note
from music21 import chord

music21_chord = chord.Chord(['D', 'F#', 'A'])
scopul_note = Note(m21=music21_chord) # Automatically sets up all the attributes

Properties

• measure
  • Gets the measure in which this chord appeared in
  • Returns
    • an int, representing the measure number. For example: 5
  • Example

      from Scopul import Scopul
    
      scop = Scopul("test.mid")
    
      # Getting a chord by going into a part's sequence, if this is confusing, go to Part class section
      random_chord = scop.parts[0].sequence[0] # Sample index
      print(random_chord.measure)
    
      # Sample output
      >>> 1
    

• notes
  • Retrieves all the notes played in this chord
  • Returns
    • A list of Note elements. For example: [<Sequence.Note object at 0x000002E0651DCD10>]
  • Example

      from Scopul import Scopul
    
      scop = Scopul("test.mid")
    
      # Getting a chord by going into a part's sequence, if this is confusing, go to Part class section
      random_chord = scop.parts[0].sequence[0] # Sample index
      print(random_chord.notes)
    
      # Sample output
      >>> [<Sequence.Note object at 0x000002E0651DCD10>, <Sequence.Note object at 0x000002E0651E59D0>, <Sequence.Note object at 0x000002E0651E4050>]
    

• length
  • Gets the length of the chord in quarter length
  • Returns
    • An int that indicates the chord’s quarter length. For example: 1.5
  • Example

      from Scopul import Scopul
            
      scop = Scopul("test.mid")
    
      # Getting a chord by going into a part's sequence, if this is confusing, go to Part class section
      random_chord = scop.parts[0].sequence[0] # Sample index
      print(random_chord.length)
    
      # Sample output
      >>> 1.5
    

    
    

• music21

  • the music21 property returns the Music21 Object for the Chord object

  • Example

    from music21 import note
    from Scopul import Scopul, Rest
    
    N1 = Note(name="C4", length=1.5)
    N2 = Note(name="E4", length=1.5)
    N3 = Note(name="G4", length=1.5)
    
    
    rest = Chord(notes=[N1, N2, N3])
    print(rest.music21)
    
    # Sample output
    >>> <music21.chord.Chord C E G>