MusicVoice

MusicVoice[{event1, event2, ...}]
MusicVoice[{measure1, measure2, ...}]
MusicVoice[content, properties]

represents one sequential musical voice. Event lists are partitioned into MusicMeasure objects by the Wolfram Kernel.

MusicVoice[{
  MusicNote["C4", 1/4],
  MusicNote["D4", 1/4],
  MusicNote["E4", 1/4],
  MusicNote["G4", 1/4]
}]

Container properties include "MeasureList", "TimeSignature", "KeySignature", "MusicTempo" and "Instrument".

Instruments

Assign an instrument through the property association:

MusicVoice[
  {"C4", "D4", "E4", "G4"},
  <|"Instrument" -> "Flute"|>
]

The instrument is propagated to the generated SoundNote events and selected independently on the frontend.

Parallel voices

Put several voices in a MusicScore to play them in parallel:

MusicScore[{
  MusicVoice[{"C4", "D4", "E4", "G4"}, <|"Instrument" -> "Flute"|>],
  MusicVoice[{"C3", "G2"}, <|"Instrument" -> "Trumpet"|>]
}]

The score preview assigns a distinct color to each concurrent voice.

See the Wolfram Language reference for the complete symbolic API.