Using AnthemScore to Transcribe Music
For installation instructions and help, click here.
Open a song by clicking
File > Open and selecting an audio file and save location. Most common audio formats are supported, though the exact list varies with operating system. In the open file dialog you have the option to process only part of a song or skip finding notes and just generate a spectrogram display. You can also increase the frequency resolution and/or decrease the time step if you want a higher resolution image. A higher resolution image will take longer to generate, but doesn't affect the automatic note detection.
You can add additional songs to the transcription queue while the song is being processed by repeating the above steps. If you add songs one at a time, the open file dialog will pop up and you can adjust the settings. If you add multiple files at once, they will be transcribed using the default settings and saved to the "Default Save Folder" listed above the file queue in the settings panel. To cancel a song, click the red X next to it.
The progress bar at the bottom of the screen shows you the job status. It can take several minutes to 1 minute of music. To reduce the wait time, you can process the song in parts (such as 0 to 30 seconds, then 30 to 60 seconds, etc.) or use a computer with more processor cores.
You can edit notes in AnthemScore by right clicking in the spectrogram display. Confirmed notes are displayed as a black with a glowing border. Potential/suggested notes are shown in white. You can see more or fewer potential notes by adjusting the threshold slider in the side panel. Notes you add will be snapped to the nearest automatically detected start time. Currently, you can only add or remove notes. To edit the note type or duration you must save a sheet music file and edit in a separate music notation program.
Viewing Sheet Music
Once processing is complete, the sheet music will be automatically opened with MuseScore, if installed. In MuseScore, you can edit the file and save it as a PDF, MIDI file, or in another format. If you installed MuseScore and the sheet music does not open automatically, use
Tools > Set path to MuseScore and select the MuseScore application (.exe on Windows). Then, click the green sheet music button . This button will save any edits you have made to the notes and open the sheet music in MuseScore. The musicXML file is automatically saved in the default save folder listed in the settings panel, unless you specify a different path when opening the audio. You can also save the sheet music to a new location by clicking
File > Save As. MusicXML is a common sheet music format supported by Finale and many other music notation programs.
To see the options for saving files from AnthemScore, click
File > Save as.
CPU Load and Speed
By default, AnthemScore will use all available processor cores to speed up processing. You can reduce the number of worker threads spawned in
File > Preferences. It's best to only have one instance of the program running at a time. Multiple instances of AnthemScore will slow each other down and may overwrite shared files.
Command Line Interface
You can call the program from the command line to process songs in the background (no GUI), and automatically save the musicXML file or spectrogram data. Use the -h or --help flags to see a list of options. Example basic use:
AnthemScore audio.mp3 -a -x output.xml
A spectrogram of the song will be displayed in the main window. A spectrogram is a color plot of the energy at different frequencies over time. By default, the horizontal axis is time and the vertical axis is frequency (log scale), but this can be changed in the settings panel on the left. The color shows the amplitude. Dark blue/black indicates low amplitude and red indicates high amplitude. If the "note lines" box is checked, horizontal lines are drawn at the frequencies of the 88 piano keys. The bold white lines are the lines of the treble and bass staffs (G, B, D, F, A) and (E, G, B, D, F).
You can move the mouse over a line to see the name of the note and left click to listen to it. Select
View > Mouse harmonic lines to see the the harmonic frequencies. Those harmonic lines are the locations that you would expect to see a high amplitude if there was a note at the mouse cursor. You can view individual audio channels by selecting the channel from the drop down menu on the settings panel.
What are Harmonics?
When a note is played on an instrument, the air vibrates at multiple frequencies, called the harmonics of the note. The pitch of the note is the frequency of its first harmonic. For example, when you play C4, or middle C, on the piano, the piano string vibrates at the frequency of C4 (261.63 Hz). But it also vibrates at multiples of that frequency: 523.26 Hz (C5), 784.89 Hz (G5), 1046.52 Hz (C6), etc. You only hear a single pitch because your brain recognizes that the frequencies are multiples of 261.63 Hz and groups them together. Usually the 1st harmonic is the strongest and each successive harmonic is weaker, but it can vary. For example, the clarinet has strong odd harmonics (1, 3, 5, 7, ...) and weak even harmonics (2, 4, 6, 8, ...).
The relative amplitude of the different harmonics is partly what gives different instruments their characteristic sound, or timbre. Sometimes the 1st harmonic may be missing entirely and the only way to identify the note is to look at the spacing between harmonics. It's also possible, and quite common, for two notes to played at once where one note falls on a harmonic of another note (for example C4 and C5, which are an octave apart). When this happens, the higher note's harmonics will be hidden by the lower note, unless they stand out from having stronger amplitudes.
Drums usually occur at lower frequencies and can be identified as features that are narrow in time and very wide in frequency. Percussion instruments often produce frequencies that are are not harmonic (not multiples of a fundamental frequency).
See a few examples of what music looks like.