Amuc is a Linux application for composing and playing music.
I've uploaded this, as a .pet, here(1663kbytes):
amuc-1.7-i486.pet
Run via Menu>Multimedia>Amuc
There are sample .wav files located in /usr/share/amuc/samples, and sample scores in /usr/share/amuc/tunes. To play a sample score click File>set current dir, then select the subdirectory tunes, (from the dropbox below), then click ok, then click File>load scorefile, and again, from the dropdown box, select a score & click ok. Then click the left-hand play button.
The help is set to open using defaultbrowser. If you want to alter this to use, say hv3 or dillo, alter the file /root/.amucrc accordingly. Also alter this if you want jack as the default output.
N.B. Requires jack-0.109.2.pet.