Every movie needs good background music to underline the mood of the scene. The quality of a movie depends very strong on the quality of the sound. Make it like Hollywood: Take a Copyright free classic masterpiece and modernize it with cool synthesizer sounds and audio effects. You can import MIDI files (= digital sheet music ) from the classic collection or from the internet (Mutopia Project) and let it play with a MIDI sequencer. Change the sounds by the selection of different synthesizer sound presets and add some effects of your choice. Finally produce an audio file (= *.wav or *.mp3 file) with the producer. These audio files you can use in any video editor as music track.