As of GeoGebra 4.0, you can play sound in GeoGebra. You can play a sequence of notes by specifying the notes, or you can play sound from a MIDI file, or you can play the sound of a function. At Trigonometry - Music it is shown how to play the sound of a function.
To play the note A in octave 5 using the instrument piano, use the command:
If you want to play a note in another octave than 5, you specify the number of the octave after the note. Specifying "A4"
as note, plays the note A in octave 4. The names of the notes are the names used in the topmost applet on this page. If you
want to use another instrument, change the second parameter to another integer. A trumpet has the number 56, the code
PlaySound["A",56] plays note A using a trumpet.
You can play a sequence of notes by separating them by blanks in the first parameter. If you want to use different
instruments for the notes in the sequence, specify the instrument m by
I[m] before the note/notes.
PlaySound["A B C",0], plays the notes A, B, C using a piano. The code
PlaySound["I A B I C", 0], plays A and B using a piano, and C using a trumpet.
Play a MIDI file
You can play a MIDI file (.mid-file) by using the command
PlaySound["filename"]. You turn off the sound
that is currently being played by using the command
PlaySound[false], and you resume playing the sound using
Using the command
PlaySound[true] may cause trouble on a web page. By turning several sounds on and off,
you may get to a situation where two songs are playing and you cannot turn them off.
Also note that if this happens, navigating to another page does not
turn off the music.
The notation of the notes from Wikipedia - Note, the notation varies in different countries
More information about the command
GeoGebra - Manual:PlaySound Command
A list of the MIDI instruments is shown at General MIDI GM Mode Explained
The Beethoven, Grieg and Chopin MIDI files from Classical Piano Midi Page
by Malin Christersson under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 Sweden License