Well for the most part drums dont really play different tones in the way pianos do. So just playing the same rhythm that the piano song had would work.
you dont need to change it to get a mp3 to your iPod just go on itunes>dile>add file to library 4 video you can do mp4 (there are many more but i cant think of them all)
Music changes because it is an artform and form of entertainment constantly developed and redeveloped by creative people.
Traders, travellers, immigrants and invaders brought their music to other...