you can download MIDI files from the net but you should have your music software para ma-i-minus-one mo yung any instrument na gusto mo alisin. Kaya lang, hindi sya tunog professional na tulad ng naririnig mo sa CD's, tunog laruang keyboard na prinogram. Pwede na pang practice practice lang and you can choose songs you want to play along, Pop, rock, alternative, jazz, etc. There are some MIDI files na maganda tunog.