This isn't extremely complex, but it's my best so far, with relay events triggered in time with the music.
It doesn't have much variety, so it's pretty short, so it doesn't get dragged out. I've made four, but this is my first "official" one.
It's partly events, getting the timing close enough to look right (it was just about perfect, but got a tiny bit off in filming), and partly building and visual (adjusting light and brick locations to make it look just so).
Ah, and one more thing, it might pose some degree of threat to epileptic viewers.
It isn't terribly harsh, just enough that you should be aware.
BLLS #4 - Fasten Your Seatbelts (0:30)
I decided I should also post this one. It doesn't have any events in time to the music, but it came out pretty cool, and was fun to make. It has a silly half-inside-joke ending to it.
Crazy Light Show #2Ah! The song on this one is Chaoz Airflow by ParagonX9 of Newgrounds.
At the time I had actually simply recorded it off of a flash game without thinking.