You can generate nice stuff with ffmpeg , take a look @ this:
ffmpeg -i /home/norbert/Music/Sherlock_Welcome_to_London.mp3 -filter_complex
"[0:a]showwaves=s=1280x720:mode=line:rate=25,format=yuv420p[vid]" -map "[vid]" -map 0:a
-codec:v libx264 -crf 18 -preset fast -codec:a aac -strict -2 -b:a 192k out.mkv
"modes":
"point"
Draw a point for each sample.
"line"
Draw a vertical line for each sample.
"p2p"
Draw a point for each sample and a line between them.
"cline"
Draw a centered vertical line for each sample.
