MusicScore

MusicScore[{voice1, voice2, ...}]
MusicScore[{event1, event2, ...}]
MusicScore[{{voice1Events...}, {voice2Events...}}]
MusicScore[content, properties]

represents a musical score. Events within one voice are sequential; different voices play in parallel.

Output form

MusicScore has its own WLJS output form. Evaluating a score displays the original MusicScore expression together with an interactive sound preview:

MusicScore[{
  MusicVoice[{"C4", "D4", "E4", "G4"}],
  MusicVoice[{"C3", "G2"}]
}]

There is no need to wrap a score in Sound merely to preview it. Internally, the output form supplies Sound[score] only as the JavaScript-side preview payload; the displayed and returned expression remains the original MusicScore.

Tempo and instruments

MusicScore[
  {
    MusicVoice[
      {"C4", "D4", "E4", "G4"},
      <|"Instrument" -> "Flute"|>
    ],
    MusicVoice[
      {MusicNote["C3", 1/2], MusicNote["G2", 1/2]},
      <|"Instrument" -> "Trumpet"|>
    ]
  },
  MusicTempo -> 90
]

The preview displays the available tempo, instruments, event count and total duration. Concurrent voices receive different piano-roll colors.

Properties include "VoiceList", "TimeSignature", "KeySignature", "MusicTempo" and "MetaInformation".

score = MusicScore[{"C4", "E4", "G4"}];
score["VoiceList"]
score["PropertyAssociation"]

See the Wolfram Language reference for the complete symbolic API.