Soundwaves are cool I guess. Here's one that I generated from a song Carsten Nielsen sent me (he made lcbosearch and is making stepmix and he has nice soft hair). The colours reflect the output of a sliding window FFT I performed on it. Red is the higher frequencies, blue represents lower frequencies. The song was about an hour long, I think something like 150Mb as an MP3. That's a lot of samples. Too many, some might say.
This is another song. It also sounds good.
This is how it might look in stepmix.