Each application icon in the Qtopia environment is associated with a *.desktop file where you can modify which program or which script gets executed when you tap on the icon. The *.desktop file will be located in:
/home/QtPalmtop/apps/Applications
For example, in my:
/home/QtPalmtop/apps/Applications/keypebble.desktop
file, there is a line which read, "Exec=keypebble", which I changed to, "Exec=keypebble-ns". keypebble-ns is the name of a script which shuts off the suspend and screensaver before keypebble executes and re-enables suspend and the screensaver when keypebble stops executing. You have to be the superuser to edit the *.desktop file:
su
cd /home/QtPalmtop/apps/Applications
ls
vi keypebble.desktop
exit
exit
You can edit the *.desktop file for the musicplayer or any other program that has an icon this way.