For the music, copy the timidity.cfg from the timidity folder (which should be in the root of the SD card) into the Warcraft folder. (The one with the Warcraft.gpe in)
Edit this copied .cfg file and add the first line (the one in bold), not forgetting the space:
dir /mnt/sd/timidity/
# I've tweaked the amps pretty well, they should sound pretty good as they are.........................
You should now have music.
The same goes for other games that use Timidity (prboom etc.)
Cheers, Neil
Edit: Here's the link for Timidity: http://www.libsdl.org/projects/SDL_mixer/timidity/timidity.tar.gz